Your symptoms are very similar to mine. I too kept telling people that I felt like as if everything was a dream or rather a bad nightmare. I also had eye floaters but they went away on their own. My symptoms started with an anxiety attack after smoking weed back in July, and ever since then I have not felt like my old self.
I went to hospitals and was diagnosed with anxiety and prescribed xanax which did nothing. I spent money on anxiety books but I couldn't even remember what I was reading and eventually I couldn't read a book without becoming dizzy.
My symptoms are/were
Brain fog and depersonalization
Severe memory loss
Feeling like the world has changed
Heart would stop, then I'd get this surge throughout my body to my head and my heart would come back to life with a very faint heartbeat.
Ridiculous heart palpitations (thought I had mitral valve prolapse)
Racing heart in hot shower or when moving
Insomnia which has subsided
Extreme sensitivity to sunlight
Eye pressure followed by watering and slightly burning eyes
Adrenaline jolts througout my body
Freezing cold hands, feet, and knees
Sensitivity to cold
Those are my main ones. I too thought I had adrenal/thyroid problems but I believe their functions are being supressed by candida and will be resolved once I get it under control.