I Am 79 Years Old And Have Kidney Deaseace ,

I am 79 years old and have kidney deaseace , diabetic, and 25 years ago had heart bypass surgery. About 6 or 8 weeks ago, I developed an extreme sinistivite to hot or cold temps! Symptoms are extrem musle cramps when outside in hot temps. Inside I use a cover to keep warm even when temp in house is 79 degrees ! No one even 4 days in hospital knows what is wrong with me? Any clues would be help ful. Thanks