Terrible, gas pains can be very painful and make you think something has gone terribly wrong down south.

I am lactose intolerant and I get the same symptoms when I accidently ingest something that contains milk or milk products.

I would be curious to know if it is possible you have had a body chemistry shift due to chemothrapy and are now lactose intolerant.
Darrell

Stage 3, T3,N1,M0,SCC, Base of Tongue. No Surgery, Radiationx39, Chemo, Taxol & Carboplatin Weekly 8 Treatments 2004. Age 60. Recurrence 2/06, SCC, Chest & Neck (Sub clavean), Remission 8/06. Recurrence SCC 12/10/06 Chest.