First I want to address the fact that there are people out there that are heavyset and healthy. Not everyone whether you're heavyset or not have perfect health, even if you do, things can happen suddenly for no reason at all. With that said, I have an intolerance for certain things. I am on a medication because almost everything I ate gave me cramps, are you experiencing any other symptoms? Maybe consider making an appt with a gastroenterologist. I literally thought my gallbladder being removed was the cause of my stomach issues, but it wasn't and isn't. I am 5'5 and I am also heavyset, if you are comfortable in your body, do not let anyone tell you not to be.
I agree with those telling you to make an appointment with your doctor, have them run some tests and rule out any major issues. If they cannot find anything, seek an opinion from a gastroenterologist. It might be something that is completely unrelated to your weight and manageable!
Good luck I hope you get to feeling better!!
