I have been having problems with my stomach for a while, i was told by my doctor that i have IBS, but i fear it my be more serious. My Stomach will swell up to the size that it looks like i am pregnant and becomes very solid to touch. I feel very full when this happens, even though i may not have eaten anything. It used to happen mostly at night time, but now it is happening during the day. when my stomach swells i have a pain that i can most closely assoicate with "period pain". I also get a stiff back and pain in my lower back. i also have problems going to the toilet and constipation. can anyone help or give me some advice?