doctors are stumped.

My husband is 62 and was diagnosed May 2006 with terminal B.A.C lung cancer in oth lungs.  He has undergone chemo and Tarceva treatments.  Last month he had his left pleural cavity drained of 1 litre of fluid.  This has made his breathing better.  Just as things were looking up he came down with some undiagnosed stomach ailment.  he is constantly belching with a foul smell and his stomach is gurgling constantly.  He is vomiting every 3-4 days regardless of what he does or does not eat.  He has lost 20 pounds in 3 weeks.  He has had ultrasound, xray, blood tests and catscan to no avail.  They have found no obstructions and no cause for his problems.  He will be going to see a specialist in 2...