I have experienced all of your above symptoms! I'm not a doctor, but I was diagnosed with generalized anxiety disorder with OCD. I completely obsess about anything I feel, and it just makes it worse. It started for me really bad after my second son was born. I've been on Zoloft, and would highly recommend taking something! If you don't take any other medications regularly then you won't have to worry about the mixing of drugs. I've been told by two doctors and a NP, that those meds are completely safe, and that Zoloft is the lightest of them all. Hang in there, it will get better! I tried therapy, but it wasn't very helpful for me. They wanted to focus on blaming someone for making me anxious, and I just wanted to focus on getting better! ! Take care!
I'm not a Dr so I can't diagnose you. I can give you my opinion though. It sounds like generalized anxiety disorder and possible depression to me.
Have you thought about therapy? It can really help with your anxiety and possible depression.
I guess I should add that I have had brain fog and derealisation pretty bad these days too, is there anything I can do to feel like im in my body again??!