No I'm not on a diet lol. i eat like a pig lol. I might be an Ucler I'll have to look it up.
It might sound stupid, but are you on a diet? Sometimes hunger pangs can be crippling to some people, and a shock if you're not used to it. Also, could it be ovulation? Not really in the stomach, more to the side and a little lower, but could be mistaken for the same area. The compression would help that, but not the Peptobizmol, so maybe not, it was just a thought...
I agree with KristyMc89, it sound's like an ulcer if it's from your actual stomach area (some people call their bowels their stomach). I really think you should go see a Doctor, especially if it's been going on a while. I wouldn't try taking anything else at the moment. Just do whatever you can to ease the pain when it happens and don't get too stressed and do try and see someone about it.
If Pepto Bismol helps, then it you're probably right about it being your stomach. Stomach pain like that could be caused by an ulcer. Stomach ulcers are now known to be caused by bacteria, so simple antibiotic treatments can cure it. If the pain persists, see your doctor and get a diagnosis. If it's an ulcer you could be feeling better soon. Good luck.