Can I complain about a painful colonoscopy?

I had a colonoscopy 2 days ago. The sedatives had no effect. I was made to suffer through the procuedure. I was shaking and crying through the pain. 5 people were watching me I didn't know who they were. 1 doctor had to hold down my stomach to stop me from wriggling around and making it worse. I had another nusre wiping my tears and trying to soothe me. They tried different meds with no effect what so ever. They were all sympathetic and I don't feel angry with the doctors. I do feel however I should not have been made to suffer through this. I was very emotional after the procedure. I felt bruised and violated. The doctor came out to apologise. This proves to me that this should not have happened. I am still off work with painfull stomach cramps. Do I have grounds to complain?