How can tell if stomach pains are gas, touch of food poisoning or something else? I have a painful bubbling gas in my stomache and have had it for 3 days now and it won't go away. At first I thought it was just gas but now I'm wondering if I might have a touch of food posing or something like the stomache flu. These pains have kept me up for 2 nights now, I am so tired, I can't do anything with out doubling over from the pain. I have tried to eat but I just can't. When I drink coke, sprite, or something that makes me burp it feels somewhat better but not completely better.  I do not have medical insurace and I don't have the money to go to the doctor so,  if there is anyone out there that has any suggestions on what I should do please let me know.

Summarized question: How to distinguish if stomach pains are due to gas, food poisoning, stomach flu, or something else?