I'm interested too. Raising my dose left me feeling blah for the next two days.
My lack of pleasure isn't severe enough to stop the shots, but right after injecting I feel like every action happens in waist-deep mud. Starting or keeping up with anything optional becomes very difficult. Improvement shows up on day three and the feeling disappears by day four. Has anyone come across quick fixes for those first couple of days, maybe something that creates artificial drive?