Super Stressed

I know I've been really stressed lately, but over the last few days my stomach has been feeling really clenched. The feeling has gone away on and off, but it keeps coming back. I don't want it to lead to any major problems (a friend of mine ended up getting an ulcer due to the stress of school last year), so I decided to get this really comprehensive dvd on Stress Relief. I'm really hoping that it will help. Unfortunately it won't get here until sometime next week at the earliest, so I'm going to try other exercises (and yoga dvds in particular) in the hopes that they will help me out in the meantime.