I am a 53 year old female and I've been experiencing nausea, stomach pain, hot flashes with sweating, cold chills and headaches all intermittenly ( every 4-5 days and could last 2 - 3 days) for over a year and a half. I've been worked up for cardiac (all the tests), adrenal gland, stomach with endoscopy, sonogram and CT scans. What else could be giving me these awful symptoms.