Coffee helps, but I would say that stimulants in general help to mask my symptoms. Surprisingly, low dose pseudoephedrine (just 15 mg) does wonders for me. More recently, I started on Wellbutrin and it seems to be helping.

Of course there's a debate as to whether stimulants will prolong recovery, by affecting the amount of rest that you're giving your brain. Logically you would think this might be the case, but I'm not aware of a medical study which proves this.

My doctor had a good argument, which is that staying at home all day and being on disability or unemployed (which is where I'd be without stimulants) leads to depression, and that's most definitely bad for the brain. I gave myself 5-6 months of rest, but about a month and a half ago (I just hit month 7 post concussion) I decided to go with the stimulant approach. It has indeed been good for my mental health.