Aniracetam may be just what you need. I found a jar of it in a junk drawer the other day, nearly full. It's in the family of cognitive enhancers like modafinil. After giving it second got I will say it's effects are noticeable and pleasing. Energy, improved attention and a better singing voice are the pluses. You do have to take a fair bit however, fat soluable, and it will keep you regular.
I recently tried Modafinil for the first time and it's simllar but stronger leaading to potential anxiety and speeding.