Fear of losing natural sharpness has had me avoiding antidepressants, which I should probably be on. Just too much fear about losing edge for math/programming.
Wellbutrin could fit here, it's energizing and doesn't make your feelings 'flat' but careful with the insomnia. I had to stop it because of that, and after a week or so of stopping it I started having tinnitus (the morning it started I woke up from a dream similar to EHS - exploding head syndrome)
Could be related/unrelated, who knows.