Mysterious dizziness and other symptoms

For about a year now (I noticed symptoms last February but feel they got worse around Easter) I've had bunch of strange, disruptive symptoms that have never completely gone away, one of the most notable being dizziness or lightheadedness. Over the last year, I've had numerous doctors appointments with multiple specialists and had a number of tests done trying to identify the cause and alleviate the symptoms, but I've had little success.

The dizziness or lightheadedness, which is probably the most notable symptom, fluctuates in severity over time but has never gone away completely since it began. I'd describe it as a floating, rocking, or swaying sensation and sometimes a feeling of being pulled in a direction (not always the same direction). I think I can safely conclude this isn't vertigo because there isn't a spinning sensation or feeling that I'm going to throw up and I had a VNG that came back normal. The dizziness also seems to worsen with head movements, in the dark, or with my eyes closed. This dizziness is accompanied by actual balance problems, although these are not severe enough to have made me fall over so far (but I've come close once or twice). These also worsen with head movement or darkness.

On a potentially related note, I've had other symptoms that may be connected to the dizziness but are less disruptive and/or less frequent. For instance, I've had either headaches or pressure in my ears/head. I don't know how to distinguish which it is, but it's basically a throbbing, congested sort of feeling in my head that can be very bothersome but not necessarily outright painful. Although I don't experience a lot of ear ringing and it's not that loud when I do, I have noticed faint ringing in my ears multiple times while lying in bed, usually along with a headache. These come and go fairly unpredictably, but they don't happen every day and they vary in duration (usually a few to several hours).

Apart from these, I've had some disruptive cognitive and psychological symptoms. The biggest, most noticeable one is difficulty focusing and tending to involuntarily "zone out." This happens pretty often and definitely seems more extreme than before symptoms started. Additionally, I sometimes have felt drained of energy and/or physically weak (though I don't know whether I really was any weaker physically). This is less frequent but can be very problematic when it happens. Finally, although I've had Generalized Anxiety Disorder since childhood, there have been some issues with anxiety and mood on and off. However, I think these are a result of my ongoing symptoms and the inability to explain or treat them effectively more than they are symptoms themselves.

Last comes the really weird stuff that doesn't seem like it'd be connected but has been occurring together with those other symptoms. One of the first things I noticed pretty suddenly was a tendency to get "winded" way too easily by relatively mild physical tasks that had never given me trouble before. I was working retail when this began, and one day when I was stocking shelves (which I'd done many times before without issues) I got tuckered out and had to stop to catch my breath, at which point my boss asked if I was okay. I also feel like I may have started sweating more than I should at times. When I was doing vestibular rehabilitation exercises (before putting them on hold when they didn't seem to help after over a month), I would end up drenched in sweat by the time I was done even though they weren't that strenuous and I was in a cool basement. Also, at times my face just randomly feels hot. Normally this happens when I'm in bed for some reason, but it has also happened elsewhere.

I've already seen multiple types of doctors and done multiple tests, but it hasn't gotten me very far. I had blood work done twice, and the only thing outside of the normal range was my vitamin D. I got it back up to normal levels, but my symptoms didn't change. I had a VNG and an MRI that both came back normal. I've had a low-frequency hearing loss in my right ear since childhood, but hearing tests didn't show any changes to my hearing loss. I had neuropsychological testing done, which didn't show any indications of a neurodegenerative disease, and my only noticeably low score was in processing speed (which also dragged down the overall score for attention/concentration). I also was referred to a neurootologist by my ENT after he told me he couldn't do anything more to help me. The neurootologist did a bunch of quick tests involving head movement, eye tracking, a tilting chair/table, etc. and found no signs of anything wrong with my inner ear. The only test that showed anything wrong with me was balance testing I did before then in this machine that looks like a voting booth with tilting walls and floor. And the neurologist didn't have much to tell me either after all that apart from mentioning vestibular rehab exercises similar to the ones I had tried previously and other activities that may improve balance (like martial arts, etc.).

At this point, I'm at a dead end in terms of doctors to talk to and potential explanations and treatments to pursue. And my symptoms are still the same as ever. Our best guess for a cause is something called Persistent Postural-Perceptual Dizziness, but I've never had trouble with things like grocery shopping, reading, or looking at computer screens, I can't identify anything at the time likely to have triggered its onset, and it doesn't explain all of my symptoms, especially not the weird ones. Plus the main treatments for PPPD seem to be vestibular rehab exercises, which I tried and didn't seem to help, and antidepressants, which I've already been on the entire time both before and after symptoms started.

Does anyone have any possible causes, treatments, or other suggestions that I might not have considered?

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