HELP MY DAD PLEASE.

He has been going through sever chronic stomach pains. Besides his stomach pains he gets very cold, he feels like he is freezing. His body is cold to the touch. We have to cover him up with lots of blankets and turn up the heater. On top of that he sweats perfusily . He gets nauseated and vomits. His blood pressure is even affected. Last night it was up to 191/99 with pulse raising 98. He is very pail and he can't sleep. We don't think it's the food he eats because he doesn't eat anything with nuts or seeds in it. And drinks decaf coffee. It could come on during the night , morning or afternoon it doesn't matter. We are calling them episodes now because he's been going through this for at least 3 or more years . He has been to doctors in Missouri, Arizona, North Dakota, Minnesota, and California. None of them can find any reasons that would cause this. They have put IVs in his arm and fill him with a strong pain killers. That is about the only thing that will help. But it does not help to find out why he gets this. They have ex-rayed him with and without contrast and they have given him ultrasounds. They have scoped him top and bottom and have taken all kinds of blood and urine samples and everything seem to come out to be normal. Again I ask HELP MY DAD PLEASE.