Fried? Unlikely.
Hungover as hell? Yes.
Perhaps you should wait a week, a month, before freaking out. You just took some fake lsd, mdma, and lsd, would it be not be logical to say that you're really fucking drained? It may be hard to do this, but I find extending your sights a little bit, and looking at yourself over the course of a month or a year in this situation is beneficial. You were once normal, and you will return to normal. I say fully revel in the strange and unsettling feelings you are describing, but also remember that this is a temporary condition and this will have it's own merit one day in shaping you into a happier, more well adjusted person one day.
Actual neurotoxicity in the drug world I think is a moot point. Even if you did get fried, it'd happen with repeated mistakes and chances are you wouldn't be conscious of the changes that are made. Please ignore the above comment, as this isn't something you should be worried about in the slightest.
(Much like a cave, your perception is darkened heavily, if you jump through the waterfall and face your fears, might it be brighter than what you're going through now?)