There is a natural component in green tea called l-theanine which reduces anxiety without any side effects. This is why green tea is calming despite the fact that it contains caffeine. You can buy an isolated supplement of l-theanine for a greater effect (pure l-theanine without the caffeine). I would recommend capsules since they absorb better (vs tablets). This would be useful for your few times to calm performance anxiety. Then you should be comfortable enough to go without it. I bought mine from http://www.vitaglo.com/sn1646.html , but it's available at many places. Of course all the mental techniques mentioned are vital for long term comfort, this supplement would only aid that.