and may be difficult to hold for longer duration. You may try simpler balancing poses, like navratansana(you will find how to do this in my blog, in the Health Check section. http://jaisivananda.blogspot.com), ekpada pranamasana, ordinary pranamasana (but with eyes shut). Learn to hold these poses longer, particularly the simple ones. This will power you emotionally and physically. Also, include meditations like antar mouna (which is more suitable for shy people -- the tapes are available at the Bihar School of Yoga, Munger, the contact details of which are in my blog site). Short yoga nidra relaxation is a must after every yoga session (these tapes are also available at the ashram I mentioned, or you can check out how to do this on this site www.SwamiJ.com. Time magazine did a full cover story a few years ago quoting tonnes of medical researches from around the world on how regular meditation had a positive healing impact on several difficult ailments. I hope your problem will be sorted out soon. Happy sadhana!