It should pass if you eat the right things and take anti-spazmodics (if you don't have them, ask the doctor for some). Oh, if you do have to go for an endoscopy TAKE THE FUCKING ANISTHETIC! I went without and it was the worst thing ever - worse even than amdominal surgery. Yuk
what do you UK types consider "cold"? i have a bit of an interest in weather, you see. recently around here it's been hovering around freezing, but most winters it's way colder, sometimes going down to like -25 and staying there for a few days. i miss that.