i have been dealing with same problem myself since day 1, and i have played medium stakes for 3 years, i actually sold my main event ticket to the melbourne champs because my nervousness ( shaky hands, rapid heartrate) was ruining my game, now the next problem i was faced with was i found drinking alcohol eased my stress, but next thing i knew i was drinking everytime i played poker, so soon i was drinking 3-4 nights a week and ended up with a slight drinking problem. i have been to see a pyshcologist for this issue as i consider poker as a part time job. apparently it is anxiety and usually related to stress in your life and not so much the money or intimidation of other players... so to answer your question about a pill that you can take, i now take a drop of something called rescue remedy, it is sold in many chemists and completey legal and non addictive, it will lower your heart rate slightly which will help will shaky hands, its fairly cheap, tastes bit awful though. many public speakers take this before a speech. i hope this helps, good luck with this issue and good luck on the felt!