How long will it take for my blood to replace itself?

I don't think it was the loss of blood that caused you your problem. You can loose a lot of blood and stil be ok, but if you are getting a headach with what happened, you have a different problem to be taken care of. You got some trauma to your head and those muscles need to be relaxed if you want to feel better. With your hand squeeze from the back of your head where your fingers should be adn from the front where you thumb should be. Press them together and hold tight. Now relax, take a deep breath and exhale and don't tense up any part of your body. After 30 seconds tilt your head away from where you are holding this and when it has gone as far as it can go, release the pressure and hold your head in this position for one minute. Do the other side. If you still have problems contact we with them.