"I know .... is your friend but he just didn't meet my needs as a GI doc and I don't feel he helped me at all. Can you do.... tests or meds to try? If not, can you refer me to another specialist as I really need help. Although I may have IBS and not something more serious, IBS is serious to me and is seriously effecting my happiness and my life. I'm just not satisfied." I'd also tell him that the other doc said he'd come back and just what the nurse told you. Also tell him how much you like and respect him (the family doc) & hope this doesn't jeopardize your relationship with him. There's my 2 cents. Let's see what anyone else thinks.