Do i have colitis?

I have been getting some pain on the left side of my abdomen during the past year. I've had an upper GI and catscan done. They both came back as normal, but i still think there is something wrong. It feels like a sharp pain sometimes, also a prick like sensation whenever i am full after eating, sometimes sore or tender like someone is standing on my stomach, and sometimes the pain runs sharp to the part of my back, and sometimes feels cold. Do i have colitis? I am scheduling for a colonoscopy next month and was also wondering how the experience of getting one is like? Do i "assume the position" . Also, what should i eat or drink the night before the exam? What is the cost of a colonoscopy? My friends told me i should've skipped the upper GI and catscan and gotten a colonoscopy which would provide better answers to my problem and saved me some money. thanks to all.

Doesn't quite sound like the UC that I know, but, the Colonoscopy should provide your answer on that. They will probably biopsy inside the colon and let you know quickly what is what. They are expensive, because they generally use the services of a hospital and anesthesia You won't know what position you "assume". Contact your insurance before going in, and have it done by a GI in a reputable place. The prep is icky because you have to drink a bowel prep liquid that cleans you out 24-48 hours ahead of time. The doc will provide you all of the details in advance.
Most of the time, blood, frequency and mucus are markers for Colitis. Read about the symptoms on the Crohns and Colitis Foundation website, and you can see what matches you.
Best of luck,

I agree with the others, doesnt really sound like colitis but you will know after your scope.  It could be many things and if you are female there are a bunch of possible things that could be causing what you are experiencing.  Sometimes if it is associated with meals, some doctors might suggest it is IBS.  Good Luck!

Did u find any answers from your colonoscopy? I have similar symptoms but I am still waiting to get the call for the colonoscopy