Speed King
Bluelighter
Other than what's already been mentioned, have you considered a nootropic regimen? Not just any one or two, but the right stack might help aid in your quest to replenish those neurotransmitters.
This is in addition to diet/exercise, tho; those are really key to finding the way back.
I think this might be a good time to try these out. I cannot see this hurting anything. At the minimum, I'd go for piracetam and choline and a good multivitamin. B vitamins!.