I recently purchased a tub of NO Shotgun, have heard great things about it. I've tried NO2 in the past with no results....When I take the NO Shotgun and workout I seem to be like out of breath, hard for me to breath, feel dizzy, like I'm about to pass out....I drink plenty of water with it, and while working out and don't go over the normal dose. I weight 175 lbs. Has anyone else had this problem? If so, what other options for a NO product do I have that actually work?