my friend has been having what is hard to explain, he had his gall bladder out in May, before he had that done every 3 weeks he would be a bit nausious , sp!! stools would change color just before the 3 weeks and very sleepy and needed a lot of rest. since the surgery, he has had a couple spells where he just doesn t feel good, burpy etc. and sleeps. any ideas what this might be. He is 73.