You need to get that checked out, dude. Even though Cannabis helps, it's not going to SOLVE the problem in the long run. Cannabis withdrawl? The only withdrawl from Cannabis that I know of is purely psychological. Physical withdrawl is caused by physical addiction. Unless you have some really messed up body chemistry, this would not be the case. Plain and simply, you have a problem with your stomach, and I highly doubt it has anything to do with Cannabis. Tell me, what kind of foods do you eat on a daily basis? Junk food? Lots of soda? Bring this up to your doctor. You won't need to say you smoke ganja. Just tell him/her that every morning you have extremely painful stomach cramps. I was originally thinking that maybe you get gas trapped, which can be very painful. But I would not know about this, so... yep.

Everyone here is going to advise you to talk to your doctor about this.