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.

This isn't fun, I've similar experiences.. Get a chance to open a conversation about these incidences, listen and try to understand what is our wife are thinking, why she act so.. be very sensitive and observe what she says and does throughout time, it may show some signs that triggered such temper/emotions. Reach out for help if needed.