My wife is very hot tempered and she like to hit me when she lose her temper. She will dig her fingernail into my skin and sometimes she will slam my head against the wall. I don't want to hit her back. I love her. I believe she loves me too. How can I calm her down. And stop her from abusing me like this.

Just because she is a woman or your wife, you will let her do such terrible things to you, sooner or later it will affect not only you, but your marriage. Doing nothing only means you're okay with it and she might get worst as time goes by. Talk to her and the best is to have her see a specialist to help her manage her temper.