Dulal666, im sorry to hear about all this, and just coz your a bloke, it dont mean the police laugh at you when you tell them that she hit you...I would press charges against her for assaulting you, and take advice from domestic violence unit. Also i would submit a complaint regarding the officer that was grinning at you when you told them she hit you. This is common with men as well as women and its about time someone, like yourself stood up for themselves.
Please dont be ashamed that a woman hit you, some woman can be very very violent, just the same as some men. Make sure you have pics of the injuries sustained and your friend as your witness. Does anyone else know about the abuse you have endured from her, gather all the evidence together and put it forward when you go to court. good luck and dont lose hope. x keep us informed