What Could Be Causing My One-month-long Loose Motions, Bloating, And Stomach Pain?

I am having loss motion since 1month .first I was having too much bloating problem and gas. then I have taken colospa , acotrust,ddr, but still no effect.now am taking darolac 1time ,but still in morning after motion I am having some cramp and pain and burring in stomach I feel very dull and weak.my stomach become very weak after having motion.then after taking rest and electrolyte solution I feel better.