Suggest Remedy For Stomach Ailment

I have gas pain when suppress a fart when I am out in public. My pain starts thereon and gets very severe. I cannot concentrate in my lecture anymore. I feel severe cramps in the sides of my lower abdomen. Some time i feel weak and feel my life is going out of my mouth. I feel dizzy and zone out often during those episodes. I feel hunger and nausea at the same time. It is also accompanied by occasional joint pains (hand, legs etc.). 2 months ago I had a stomach cramp in the midnight. I woke up with a severe pain and felt like having a bowel movement. But, it would' nt come that easily till, I had so much gas accumulation that I was roaring in pain. I starting ambling around aimlessly till I could get myself to have a bowel movement. At one point I passed out on the toilet floor. But after I was done I slept like nothing happened. I feel so helpless and ashamed. Please advice ?