Colonoscopy

Hi, 

Well I'm feeling so upset & angry with myself as had my colonoscopy today but had to ask them to stop as it was so painful.  I was given a sedation however did not feel like I had anything.  I was very nervous & blood pressure high so don't know wether that's why the sedative was not doing anything.  They only went a little way and have seen a polyp the doctor has requested for me to have it done again under general anaesthetic but I worried as they have said it could damage my bowel.   I just don't know what to do