Mine is low too and gets too low if I stand for too long without moving or am not moving around much (long car rides). Also, oddly, it always gets low at the grocery store. I've had to start racing up and down the aisles to avoid passing out. I've also found there's a pressure spot on the back of my neck that I pinch that also helps. Its not as noticeable to others, like if I'm sitting in a work meeting--don't want to get up and do jumping jacks. Doctors for me just say "Don't you feel like passing out?" when it registers 80/50, but I usually don't have symptoms until it gets lower than that. Hydrating does help.