Positional dizziness / Unsteadiness for 6 months

Hello, I'm posting this here as I've been told again and again and again by doctors that it's anxiety. First me: 33yo female, severe depression and anxiety since I was 7, has gotten a lot worse for the past few years. I may be psychotic, my psychiatrist isn't sure. I am anxious all the time, I even get panic attacks in my sleep (which wake me up obviously). I always have a somatic issue associated with my anxiety which always proves to be all psychiatric. Arms, head, acid reflux, 4 months of non-stop burping, fake strokes (had the symptoms but nothing actually happened).... Quite a pedigree, and this is the tip of the iceberg only. On to my current issue: I had what doctors called a BPPV attack in April, I slowly felt attracted to one side while walking and would get non-rotating vertigo when I turned my head. It calmed down when I sat and stopped overnight. The same feeling came back, but a lot weaker, a couple weeks later. I eventually tried the liberating maneuver for BPPV by myself. Doctors aren't available in my area so I had to talk about it with one online. My vertigos became non-specific afterward and also random. I would randomly slightly stagger, or veer a little to the side sometimes when I turned my head, or get this lightheadeness feeling. I developed some kind of tension headache, especially in my neck but also my shoulders and head and it does seem to play a role in my random staggering. Fast forward to today. Things had actually gotten better after all. I still had symptoms but a good deal of them were obviously psychosomatic. Nothing has been as strong as day 1. I mostly feel sleepy, and the whole thing does get worse when I'm tired or half-asleep (especially in the night) But three weeks ago things slightly changed: I started to feel very slightly dizzy when rolling in bed. I triggered my anxiety 100%, and soon I started to stagger a little more, and get more dizzy when rolling in bed... And then I'd randomly feel dizzy in big spaces with lots of people, with me staggering here and there (I was at Disneyland Paris yesterday, a real nightmare). A few days ago I went to sleep very anxious and woke up a few hours later with a heavy head and waves of punctual vertigoes and severe staggering. They were random, I could walk a few steps and suddenly stagger and fall against the wall. It got better with rest in a few hours. I called the ER, then talked with three different doctors + my psychiatrist and they all claim it's mostly psychiatrist and maybe a pinched vessel or nerve in my neck because of me being always tensed. I'm dead sure about a brain tumor or strokes, but they are all saying that if it were any of those, it wouldn't evolve like that and happen like that. But why dizzy in bed? Why all that? I'm terrified. I've taken a lot of ADs for the past 14 years, and I'm trying to lower my dosage since June bit by bit...

I also have tinnitus in random ears at random times at random volumes…
I feel dizzy randomly when just walking…
My eyes ache… Sometimes.
I feel like my left leg might be a LITTLE TAD weaker but I started to feel that when I thought about it…
Random unsteadiness when I shuffle instead of walking at a normal pace… The faster I am, the better the whole dizzy/balance thing seems to be. But when dragging my feet (like in a store, walking behind a slow customer) I might stagger, like I can’t control my weight for half a second…

Nothing seems constant. And I keep having bad nights and nightmares about multiple sclerosis, brain tumor and the like. I wake up exhausted and my brain and eyes take quite a while to adjust to the real world; meanwhile I feel dizzy and have a hard time to focus and strong, deep fear is eating up my entrails.