How to know the difference between gas, cramping, concerned discomfort, etc....

Just wondering how to tell the difference in some mild discomfort i am having. I was sick this weekend with food poisoning and still sort of recovering from that. Today i am just trying to see if I am gassy or what type of discomfort i should be concerned about. It sort of feels like mild cramping when you have stomach problems....any suggestions will be great. No spotting or bleeding though thank the lord!