Most of your symptoms seem to match up with HPPD, so I'd say you most likely have it. I was experiencing extreme pressure in my eyes (along with my head) which you seem to be dealing with, and had some pretty bad light sensitivity (trailing, halos, double vision etc). A good coping technique for this is to wear some sunglasses (I wear my prescribed ones 24/7 and a big chunk of my pressure/visual-symptoms have been simmered down. Seriously, buy yourself a pair and see if it makes any difference, I know a few others on here have had success with it as well.