What started out as what I thought was a panic disorder after weed, a year later my body has been going through some horrible things that seem to keep going downhill. To explain best - currently I’m going through this thing where I’ll be perfectly fine &amp; level headed for a week or 2, getting great sleep, not a worry on my mind, and then 2 weeks later it’s like my body turns on this dreadful switch where feelings of dread &amp; horror flood &amp; I dissociate and experience extreme depersonalization and can’t sleep, can’t think about anything else besides how I feel, I catastrophize trying to guess why these weird feelings just get switched on, and my stress levels are insane. I have extreme sleep inertia where I wake up completely disoriented out of my sleep, and the entire day is spent worrying about everything. Absolutely nothing triggers it. My blood tests come back normal , my head scans come back normal, and I’m basically healthy as a horse. I did discover I have a .4 CM cyst on my thyroid but is that even big enough to cause an impact on my hormones? 

The weirdest part is, is that one day I will randomly wake up, and the feelings vanish, and I slowly start forgetting about the random 2 week episode of extreme anxiety and depersonalization and the thought habits that formed during the episode go away as well, and when I finally get a week or 2 of feeling like myself again, one day I wake up and it starts all over again. It feels like I have cancer or something. There’s not way this is just normal anxiety. Is there something I should be getting checked out that I haven’t thought of?