Passing Out During Sex

Almost everytime I have sex I feel a little shaky, but I’ve never completely passed out. I usually just have to switch positions so I’m not on top. Then tonight we were going at it standing up and I started feeling my legs get shaky then a little lightheaded, then I had to stop because my vision was getting blurry and even my hearing was messed up.. it was super weird. Does this happen to anyone else?