What Causes Chills,night Sweats And Severe Muscle Cramps?

i have chills, night sweats, right side pain, severe muscle cramps (arms and legs), tinnitus, blood work normal (am hypothyroid, but good TSH), calcium and potassium normal, good colonoscope, endoscope. PCP, gastroenterologist do not know what is wrong. 57 yr. femaie, usually good health