Oh, that's horrible! So sorry. Your doctor told you that you have epilepsy? Did he put you on any meds and tell you not to drive for at least six months before you got behind the wheel after your last seizure? A blood test wouldn't show epilepsy. He/she should have given you at CAT SCAN or MRI if he/she suspected epilepsy. But again, were you on any meds?
If not, then I (in my opinion) don't really see how you can sue as you pretty much took matters into your own hands when you chose to drive.
Your injuries were horrible but I hope no one else was injured.
If anything, in my opinion again, I would start with the doctor and ask why you aren't on meds. and why those tests weren't performed and epilepsy was suspected...explain how you were in a really bad car wreck and all of the horrible experiences you've had to endure since the crash.
And who told you that you had a seizure in the first place when you ran the red light?
Wishing you all the best and a speedy recovery!