my son, who is 42 now, alternately gets freezing cold and then sweaty hot at night repeatedly during the night. he had a stomach flipping surgery due to extrememGERD about 10 years ago and now seems to have redeveloped stomach pains again. he has had a gastroenterologist check his recurring GERD and surgery out, had ultrasounds, etc., thinking it may be related...nothing has been found. and yet his pain is intense. he recently lost 60 lbs thinking it may be his problem. he is 6 6 and now he is way too thin i fear, and not sure his health has not been compromised by losing the weight so fast onthe paleo diet. is there anything that could tie the nighttime problems, the old surgery and current problems together. are there any specialists he should see?