Im afraid i have brain damage?

i had meningitis a year ago almost went into a coma and was hallucinating and vomiting for hours before i got to the hospital i dont remember much from it after that it seemed like my personality changed i was obsessing with dying and did alot of stupid things i was 16 then 17 now i huffed alot of things for a long time gas cleaner paint thinner every night sometimes several times a day i tried to hang myself and was found unconcious i had broken blood vessels in my face for awhile all of this happened within six or seven months i have gotten better stopped doing all that stuf now i get severe headaches go into rages cant remember what i did yesterday my head gets foggy i dropped out of school i take adderall every day for adhd seroquel cuz i cant sleep at night i feel alot slower and stupider i know it sounds crazy im worried that i permanently damaged myself and wont ever be the same idk what to do about it please help i wanna continue to get better but this is always on my mind