I am experiencing the following set of symptoms on a daily basis. Regardless of the awakening time, upon exertion after getting up i begin to sweat profusely, nausea, loose stool, followed by complete exhaustion requiring bed rest. I have had a endoscopy, colonoscopy, chemically induced stress test, ENT exam, sleep study, pulmonary exam. I have a single chamber pacemaker due to chronic AFIB and had a heart catherization indicating two small blockages not requiring anything at this time. These symptoms lessen and ultimately disappear by late afternoon, I am a 70 year old, caucasian female. Any suggestions or directions on how to proceed would be appreciated.