Remeron and suicidal thoughts

My husband has been taking Remeron for about a week. The first effect was, totally knocked out and slept for almost 24 hours. That soon wore off and now he is abusing the drug he takes not the 2 at bed time but 4 throughout the night. He has used up 22 pills in one week. He is not sleeping at all and is extreamly diffacult to live with. He is edgy & rude to me and our 16 year old daughter. He feels like he can do and say anything, not just to us but to anyone. He also had nightmares and talked all night in his sleep when he was taking 30mg a night. I hate this drug and what it is doing to our family. My husband has a brain injury(1988) but he has few motor skill problems just depression and cognitive trouble. Has anyone had suicidal thoughts? He has had them in the past and I'm hopeing we won't have to go through that again. He cut his wrist in 2001, and spent 2 weeks in the mental hospital. I know this is an extream case but I need help.