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.

Domestic abuse in any form is not acceptable, be it wife hitting husband or the other way around. Talk to her and make her realise what she's doing is wrong. If still can't be resolved, seek professional help like from a marriage counselor or suggest she get help regarding her anger management. Main point is she needs to realise what she's doing is wrong. Doesn't matter that she's your wife or the weaker sex - domestic abuse in any form should not be condoned!