My Body Temperature Has Decided To Go Haywaire. I Get

My body temperature has decided to go haywaire. I get extremely cold and then I get confused like hypothermia or hypoglycemia. I have a couple of extremely disconcerting incidents when no on knew I had a problem. I'm not thinking it might be pituitary. My thyroid has not worked properly since approximately 1998. I've taken levothyroxine for years