Hi, my stomach hurts and it's not period pain or food poisoning. The pain radiates through my back and my head hurts too. I feel like throwing up and I fart without trying. My fart stinks and my stomach feels heavy and bloated. The pain in my stomach comes and goes every 10 minutes and it is very excruciating. I feel weak and don't want to get out of bed. Plzz tell me what medicines should I buy. Thank you.