See a gastroenterologist immediately. Green bowel movements can mean that there is too much BILE exiting your body - could indicate a serious digesitive problem. I had similar problems, though it was fissure/hemmorhoids for years...now I'm on Questran a medication that is a bile sequestrant and no more pain.

Please please please STOP trying to self-diagnose. Leave this to the experts - not just a proctologist, but also a gastroenterologist.

You can live normally again, but give the solution to those who can help you. You will need a variety of tests. Don't decide what is causing the problem or what the problem is. ONE doctors opinion with or without proper examination/tests (digital/flex-sig or colonoscopy) is JUST an opinion. Please get immediate consulation.

----Carbolite as with most carb-free goodies/companies use Malitol or Mannitol = sugar alcohols and everyone has a different reaction to those. Most cause gastrointestinal upset or worse as expressed here. Remember when OLESTRA (fake fat) first came out in potato chips? Know why it isn't there anymore? Yep! That's right. BIG digestive troubles...after all...who can eat just ONE? BEST BET - STICK TO REAL FOOD!
Did you also notice that A SERVING of a carbolite chocolate bar is ONLY 2 LITTLE SQUARES??? Wake up America...aint nothing really FREE. (yet)