Derealization. Where nothing feels real, like you're in a permanent fog... I had a derealization episode for a few months after moving. It can happen after shock, whether that's trauma or just uprooting yourself from one situation to another.

Also I used to get SEVERE side effects from basically any psych medication I took. Similar kinds of meds from the same mild/"safe" family could have completely different effects, like nonstop nausea, hallucinations, dizziness, restlessness, psychosis, suicidal ideation, the list can go on forever. I would get severe life-threatening reactions from taking half of the lowest dose of anything. I had a lot of doctors question my experiences, or dismiss it as psychosomatic -- I have anxiety, or expect to get side effects, so I do, thanks to my brain tricking me. But then I'd get reactions like serotonin syndrome (+ seizure) or eosinophilia which cannot be psychosomatic and docs were left just as confused. After 7 years of trial and error and error and error with psych meds and almost dying a dozen times I was finally genetically tested and diagnosed. I'm missing an enzyme in my liver, so instead of being processed and cleared properly, medicine just poisons me instead. Of course it sounded like I was nuts the whole time. :(