Ugh, I think we all get this now and then, and so do "healthy" people. It's very uncomfortable! Have you tried gas-x? It really can work. Some have suggested trying rolling around on the floor. Really!
When I was young I went to the ER once for it, I was bent over in pain, and all they did was watch me until it subsided on its own. So I don't recommend going to the ER (well, ever).
But go ahead and try to get into your doc, even your family doc, maybe they can help.
49 year old female attorney, diagnosed UC/pancolitis 1985, no surgery but much suffering. Asacol/5ASA 6x400 mg maintenance for 20+ years; use prednisone & Rowasa for flares.
August 2008 sought care of naturopathic doctor. Food sensitivity test showed wheat/gluten, other intolerances; eliminated all wheat/gluten from my diet. Probiotics (Ultimate Flora, 50 billion), trying Curamin.
Flaring, seasonal? or supplements too harsh? Back on prednisone, trying 15/20 mg. Appt 3/6 to discuss Humira, etc.