Pain under ribs & rectal spasms (vibrations)

My doctor says I have IBS and has been treating me with probiotics, a homeopathic anti-spasmodic and glutatamine. I've been taking these for over 2 month and have had very little change. I have nearly continual pain under my lower right rib cage that starts in the front and goes around to my back. It often feels like I have a golf ball shoved under my rib cage. I've also had nearly continual rectal spasms. The spasms don't hurt, they are more like vibrations, but it's rather disturbing. I am not constipated and I don't have diarrea. Originally I had spasms up higher in my intestinal track (under right ribs), but those have stopped. Anybody else dealing with this Any ideas on how to treat it? I'm tired of the pain.