If this problem has arisen since last 45 days only...n you were perfectly alright before that...then most likely you r having IBS ( irritable bowel syndrome)...stress/anxiety/Recent Viral Infections/ Intestinal bacterial infection/ worm infestations in ur intestine/ some new food item introduction in ur diet/some medication recently started) all these can be the causes. For the proper evaluation one should talk one to one basis. Regards.