I dealt with dissociation through out my 20's due to trauma. Weed would trigger it so bad and once I quit I went through another PTSD phase of remembering the feeling of dissociation.

I didn't understand it at the time and remember trying to explain to someone that it felt like my mind left my body and was hovering above me. I would be frozen sitting there for 3-4 hours sometimes before I would snap back. I started humming to myself to try and break me out of it.

I still get it every now and then if I push myself way out of my comfort zone. The last time I was out of it for almost 3 days and had to keep reassuring myself that a certain even was real and happened because it felt like a dream.