Can your stomach have problems like constipation, diarrhea, bloating & mild pain after stop smoking. is it one of the symtom? thank you!

Yup: It's w/drawal effect. A week or 2 should be all but read this and try the ideas. Modify diet, drink more water and do breath pattern of smoking w/o the cigarette since that is a very good pattern for relaxation. The mouth blow exhale especially! Do it as often as you did when you smoked. It will help! http://www.etsu.edu/tips/education/cessation/whattoexpect.aspx