[aaxlerodball]

As a first line, I'd like to echo graeme. Sleep, diet, and exercise are tremendously important and you should make sure those are in good shape first.

I've found mild anxiolytics (benzodiazepines like alprazolam and clonazepam) amazingly useful as a secondary, occasional relief from anxiety that is harming performance. I wouldn't want to take these every day, but they can be very useful for mitigating acute anxiety.