HELLO MY MOTHER WHO IS 70 years old, she had a double mastectomy in October and started chemo. In January she had a heart attack and a stint was placed. she is currently taking coreg, Lipitor, Amiodarone, Glipizide, Allopurinol, Levemir, Brilinta, Prevacid , Apidra and asprin. We have been to doctor several times and they have taken her off meds and lowered the dosage on others but my question and concern is between 4 and 6 am she has real bad sweating spell followed with chills. Sometimes very short spell and then other times it could last several hours. She becomes very weak and feels its not safe for her to walk. Any idea???