I'm guessing you're flaring right now, right? Where is the pain located? I had really horrible abdominal pain when I first got UC, before I was on any meds. It was unbearable and I couldn't sleep because of it. But I was also having other symptoms, like bleeding, mucous, urgency, D, 25 BMs a day, etc. But the pain came before the rest of my symptoms became severe.
I'm not sure why you're having pain though. Gas pains can be really painful, too. If you feel better after passing gas, maybe it is gas pains. Seems odd it would last for 2 wks though. I'm sorry I can't really help you, but I hope you feel better soon. Hopefully, your GI will call you back soon. Keep us posted as to how you're doing.