Why do my calves hurt?

So my friend was piercing my eyebrow, I've had a few other piercings including my septum. I was sitting on the floor while my friend was sitting in front of me on the bed. He already pierced it and was sitting there for about 5 minutes trying to stop the blood. I told them I didn't feel good, and there was this distant fuzzy static noise in my head. Next thing I know there are 2 people up above me screaming my name. I blacked out and fell backwards and I guess I was out for about 30 seconds. This is the first time this has ever happened. But so , someone had to help me up and hold on to me, my calves hurt so bad that I could barley hold myself up. 7 hours later, they are still killing me and I can't stand for too long, any one know why?