How to get rid of fear of blood?

It sounds like you're solving the problem all by yourself. If you are interested enough to consider the medical profession, you will find that understanding all the body functions will make it less scary. Exposure to anything like blood produces a reaction in people and for a very good reason. We are SUPPOSED to have an emotional reaction. That way we do something about it when we see blood coming from an injury. Some people just react more strongly than others. When you think about it, this is a good thing. Now you just need to condition yourself to react, but then act - to help, rather than faint. You'll do fine. Good luck.