I havent had a bowel movement is 7 days. It hurts so bad! Please need advice?

I have been to the drs and they just give me medication or different fibers. I have tried every fiber and laxative on the market including magnesium citrate and nothing is helping. I waiting for a colonoscopy and cat scan. With my hmo plan I have to wait a month and get refered. I cant wait that long. I dont know what do. Anything that will help. I eat fruits and vegetables. Stay away from sugars and fatty carbohydrates and drink water.