I have a few questions, that I think might be useful for you.
1. Do you have difficulty with focusing or hearing your own voice internally as well?
2. Like, do you THINK the way you used to, just without emotion?
3. Are you disinterested in doing stuff as well?
4. Can you still make mental images? Like, if I say, picture a turtle, can you then think of a turtle, and sort of how it looked like, when you watched a cartoon or a wildlife documentary?
Btw, I think it's too early to say you have excitotoxicity, or permanent brain damage, or ANY kind of brain-damage - but if that turns out to be the case, then there are ways around that as well - they're spelled Dihexa, Lithium, NSI-189, Memantine and Ketamine.
(and that's just the stuff I can think of off the top of my head - there's a plethora of stuff for you to try once we are certain about what your issues are, and what can be done.)