I'm awaiting the results of several tests, mainly for my heart to rule out heart problems. But the Cardio also had me do the blood test for Pheochromocytom and I should know the results next Monday. My symptoms started almost a month ago, with a panic feeling and adrenaline rush followed by my heart rate going up. I've had multiple episodes, with my heart rate being higher than normal inbetween (although the cardio put me on Atenolol, which seems to lessen the symptoms and higher HR). My blood pressure was only a little above normal on my last cardio visit, but I've read that some people with Pheo don't have high BP. Other symptoms are being cold during the "episodes" (which happen more at night), weak/tired feeling (which could be from a combination of taking the Atenolol, not sleeping well and then taking sleeping pills), stomach ache and no apetite (could be stress?) and lately small headaches. My main concern in the mean time is a stroke! I'm a very healthy 46, have run for 25 years, eat healthy, moderate drinker, etc. This is all driving me nuts and I don't even know if I have it or not, but there doesn't seem to be a lot of information.