For about 6 weeks now I have been suffering from light headedness, heavy legs, weakness and the last 2 weeks a touch of diarrhea. I have been to doctor, emergency room, seen cardiologist and neurologist and vascular consults. Had several EKGs, MRI of head and ultrasound of neck (I have subclavian stent). Blood tests don t show anything. BP is fine. Cholesterol is well managed. I am 49 female and have not menstruated in almost a year. I am continuing to see doctors to find out what us wrong but I am almost unable to walk down the street due to light headed and weakness in my legs. What are the possible causes?