30yrmale.weak,sweaty,tingling,orthohypo every 3-4hrs.gtt,treadmill test,ct/ultrasound normal.rft,sugar,tsh,cortisol,b12,vitd,esr normal.whats going on?

More data: There isn't enough data, even with the tests you've reported, to make a diagnosis. That said, I'll bet if you supplement you diet with more salt - sodium chloride - you'll raise your BP and feel better. And it doesn't cost anything. Simply salt your food liberally (to taste) at every meal, drink plenty of liquids (not diuretic drinks like coffee or tea), and see if this helps.