Serious unknown problem need help

I am 20 year young healthy male,So for the past 6 months I've had this horrIble problem that after ejaculation I would get pain an intense pain in lower back, pressure pelvic pain under belly button ,pain in my hips, thighs and calf, acomponied with sore throats and a heavy mucus cough and these symptoms would last for 1-2 weeks and then I would go back to feeling completely normal. Alcohol would make the symptoms a lot worse and at the time where it started I couldn't drink one beer without getting extreme lower back pain, a prickly pain in my left testicle and hamstring and I would have no energy in my legs and would feel extremely exhausted after just a 15 minutes walk.The pain would also radiate up my back and around my ribcage. My testicles would also be red for the 1-2 week period but never swollen. Lying on my side always made the symptoms worst and if I fell asleep on my side I would wake up with a light temperature. So then I abstained from alcohol and masturbating for over a month. Then when I tried masturbating the leg pain had gone and the back pain was far less. Then maybe a week later I had sex all the usual pains I used to have had completely gone and I felt normal. But then the 2 days after that I went out drinking both nights and after the second night I started to get the chills then I got one of the worst fevers and headaches I had in my life my whole back and legs were in complete agony and even lying flat on my back was extremely painful, I also noticed blood in my spit. Now this is around 3 months in I don't feel great after masturbating and have some pelvic pain under the belly button but no back pain and little leg pain. Then I had a cystoscopy everything came back clear also had a ct urogram also came back clear and ct of testies also clear. Then gradually in the last two months I realised the veins on my purple and dark blue veins started appearing all over my penis and started to get more and more prominent with some little pink spider veins appearing at the top. I've also started to get rashes (not itchy) on my hamstrings arms neck, chest, feet and face and they seem to only appear after ejaculation up to 2 weeks after. I tried the antibiotic trimethoprim and after the first day the exact same back and feet pain pain that I hadn't had for months came back, my feet went and hips and lower back went extremely red and hot so I stopped them after the first day. Since then after ejaculation now my whole neck goes stiff and I get throbbing and also pressure pain in the side and back of my head. I also get whole red sections in my eyes on top of that and some pain in my ears also. I now get an achyness in my chest and heaviness feeling in my chest and my heartbeat starts racing just from standing up and a pain in my Achilles and tops of my feet, but the back pain and leg pain has mostly gone now.I've had blood tests urine tests and doctors and urologists can't find anytthing and have no idea what to say. There are two things I think this problem might be linked to: 1: around the time this started I had a male sex toy called a flashlight and one day after using it I rinsed it and didn't clean properly then I didn't use it for 2 weeks . I come back and it stinks and there is some yellow mould in the bottom I then cleaned it with boiling hot water but I never used any alcohol to clean it which I should have then I used it after cleaning with hot water so maybe I caught something from that? (Sorry for the horrible story I am quite embarrassed by it

2 when I used to smoke weed I would get some pain bellow belly button and in my lower back and hamstrings and I would also feel blood pulsating around my hamstrings and back. And there was one point after smoking where I couldn't pee anymore for 4 days and that was just from smoking the weed. So I stopped smoking since this problem has started

I will attach pictures of the rashes and veins on penis bellow

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