Beaten by my girlfriend

I was beaten by my now Ex girlfriend, the law didnt protect me. It started about 6 months after we got together she would flare up over over anything and push and shove me out of the way and scream then attack me, then one day my father came in not long after one of the attacks on me and saw me covered in blood he told me to phone the police. but my girlfriend at the time came in the room and started screaming telling my dad I hit her, then calmly turned around to my dad and said who do you think they will believe him or me. Anyway she obviously panicked and phoned the police and told them I attacked her even though the only mark she had on her was on her fists from punching me. I was arrested and was locked up for 6 hours. Obviously they dropped the charges and stupidly I went back to her after a few weeks. I didnt press any charges on her as she had my son.. Anyway then one day slapped my bottom joking about, so I slapped her on the bottom not hard just as she did with me in a joking way. she only went and phoned the police, and I was arrested again I explained what happened to the police but I was locked up for the day and then taken to court the next morning and found guilty I was in shock I couldnt believe how idiotic I had been she had been waiting for that day she could get at me. Then an injunction came that I could not contact her. Anyway She kept phoning and phoning me and I didnt answer then a txt came and told me my son was really ill and I to get there fast as he had to go to the hospital. So in a mad rush I got there and took my son to hospital, my ex came to the hospital obviously, anyway my son had to have an operation but he is now fine. Anyway a week later the police arrested me telling me I had contacted my ex and I explained why I had contact with her but was still arrested and I was taken to court again, she had told them I visited the house on a few occasions which I did not, and that I had spoken to her on the phone which I did when my son came out of the hospital she rang me to tell me all was ok with him but that was it. I was again found guilty and spent 8 weeks in prison losing my job and my new flat I got myself after we split. The funny thing is even in the court papers it stated that she hit me first  yet she got away with that and I was found guilty, "Go Figure" thats saying if I hit someone with a bat and they hit me back I would get away with it and they would get charged "huh" not right at all, she also phoned the police to tell them I had rang her and threatened her, but luckily the time she gave them that I had rang her and threatened her  they had already arrested me,  but again still nothing was done about her. So all in all she ruined my life and I still cant get a job and now living back with my dad and haven't been able to see my son for 6 months as I cannot contact him then I decided to go through a contact center to see my son as I miss him terribly, they rang her and asked her if I could see my son through them and that she didnt have to have any contact with me. No was her reply. I have to try and get on with my life and just keep applying for jobs dont know if I will ever get one as they all do checks nowadays and as soon as they see I have been in prison I am let go, or if they ask me in an interview I have to tell them the truth and hope they will overlook it after some explanation but no luck so far.