My son beat me up a year ago

My son is bipolar and wasn't on medication on October 1, 2011 he exploded on me and beat the crap out of me. He could have killed me. He broke my nose hairline fractured my cheekbones, split the back of my head open and gave me a bad concussion. I pressed domestic violence charges in the hopes of him getting the help he needed and that brought me into the justice system which I never had been through before. My sister decided to disown me completely because she told me I was to blame for what he did to me. The court system is really slow here and it took until last July to find out what was going to happen to him. At first he was going to make me testify at a trial and I didn't want that and it made my emotional health worse even thinking I was going to have to do that. In July he ended up taking a plea which meant he plead guilty and he was put on 3 years  probation and he has to be on his medication. I haven't spoken to him in a year and my heart is breaking over it. I love him and it is hard for me to know what he did to me and not get blistering mad over it. All I know about him is what I hear and he is doing well. I don't know if I will ever hear from him again and that breaks my heart.