Constant, Maddening Nausea

Hi, all. I'm a 35-year-old female who has been struggling with pretty bad nausea for about a month now. It all came on very suddenly; I felt a thick mucus in my throat that made me feel gaggy, and my stomach felt bloated and ... well, off. When it first started, I felt extremely bloated, to the point where my stomach was painfully distended, and I could feel pressure in my throat, which make me feel even more nauseated. Funnily enough, eating would sometimes make me feel a little better because it'd help induce belching and passing gas. Now, I don't know if the belching is from constantly swallowing air due to the mucus/anxiety, or if something else is going on that's both causing the mucus and the bloating. I have a pretty bad case of emetophobia (fear of throwing up) and anxiety/depression in general, so I freak out whenever I feel nauseated. I'm still belching a lot, but it's not as bad. 

My other symptom is that I'll have a burning sensation/upset stomach around my belly button area and to the left and right of it. It feels sort of gassy. I don't have traditional heartburn symptoms in that I don't feel a burning sensation higher up between my ribs or underneath my sternum. I occasionally do get a vague, subtle burning sensation in my throat, and once or twice, I felt food regurgitate a little bit. I also get gurgles in my throat, but maybe that's from swallowing air. I don't know. I'm considering the possibility that it could be GERD/LPR. If I fall asleep when I feel gassy/sick to my stomach, sometimes I'll wake up feeling extremely nauseated and with mucus in my throat, which tends to get better once I sit up, belch, and calm down. 

This may or may not be relevant, but about 15 years ago, I dealt with similar issues. I lost a lot of weight and was dangerously underweight at one point. I had a gastric emptying test, and it came back showing that I could have gastroparesis. Here's the thing, though: I only took a few bites of the test meal, and it was a ninety minute test, which I've read isn't totally reliable. I've also read that not eating much for months at a time and losing weight like that can cause temporary gastroparesis, so I don't know if it was that. What I do know, however, is that I've been perfectly fine for the past 12+ years, though, with no GI symptoms whatsoever. I'm actually overweight now (unfortunately), and my appetite hasn't really suffered throughout this recent ordeal. When I was sick back in the early 2000s, my doctors mostly attributed my issues to anxiety, so maybe that's a big issue now, too. I don't know, but whatever it is, it really sucks. 

Anyway, I hope to see a GI doctor soon, but do y'all have any idea about what could be going on? Your input would be very much appreciated. Thanks! 

P.S. FWIW, I've been tested for h. pylori so far, but it came back negative.

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