Sorry to steal this thread but i couldn't help pick up on your comment about the "nausea on and off". Maybe it will be some food for thought to PIN, and whoever else with GI problems, I don't know.
I went on Gleevec in 2005 and had my Gall Bladder removed in May 2007. I had experienced NO pain as I didn't have any gall stones, but my gall bladder had quit working properly. Like you I had been having issue with nausea and vomiting from when I started taking Gleevec in 2005 and as you can see well into 2007. I would vomit and get a slight fever, call my onc, and she would send me to the hospital. Well one day I had went for my annual check up to my primary doctor and had been up all night vomiting. The doctor said Pam I think it is you Gall Bladder. I had three different test done, the first two did not show gallstones, the 3rd test took 2 1/2 hours (no gallstones). The last half hour of the test the tech said "she was going to inject something into my IV and if got sick, that meant that my gall bladder wasn't working, and yes I did get sick. I forget how the gall bladder works, there is a bile duct tube going from the gall bladder that empties into intestines, well evidently the bile was not passing from one place to another. Sorry I will have to google gall bladder and how the bile empties, I have slept since then. Anyhow the surgeon said my gall bladder looked perfectly normal but then the test showed it wasn't opening up correctly from the tube. Anyhow I didn't have anymore of the attacks so I am sure it had something to do with the gall bladder not working, but NO pain and no stones, perfectly normal looking gall bladder.
I do sometimes wonder if the Gleevec was toxic to my gall bladder. In fact my primary doctor had mentioned that " Pam I think it may be your gall bladder, you take Gleevec" I guess I will never know. All drugs and chemical have toxicity, but guess we don't have much of a choice there. You know how the doctor is always punching around the spleen area, well I was thinking the gall bladder is somewhere in that area.
Anyhow just thought I might chime in and say check out your gall bladder, remember I took 3 different test, but they decided it was my gall bladder and I didn't have stones.
Ah here is a good picture of the gall bladder and bile duct.
"In response to signals, the gallbladder squeezes stored bile into the small intestine through a series of tubes called ducts. Bile helps digest fats, but the gallbladder itself is not essential. Removing the gallbladder in an otherwise healthy individual typically causes no observable problems with health or digestion yet there may be a small risk of diarrhea and fat malabsorption."