I'm having suicidal thoughts?

I'm finding it really hard trying to be happy all the time and bring up 4 children and look after the home and the great dane. My partner is now living with his parents as it became impossible for us to live together as he has a brain injury and basically I get all the grief and am a 'Captive audience' when he starts. He was abusive and aggressive in front of the children so he had to go! I am trying my best to carry on and be strong for the kids but all I think about lately killing myself. I have no one to talk to and these feeling are becoming stronger every day. Please help I'm desperate x