Abusive Language and High Temper. Help.

My father suffered a major stroke in 2008 and his complete left side got paralyzed and from that day he is just in his bed. He can talk and think clearly but can't move. Since this condition he has been in high temper all the time probably due to frustration. But since last year he has become terribly abusive and uses terribly slang languages for everyone including me and my wife. I have been care giving them for the last 12 years now and for the last 3 years my mother has been diagnosed with stage 4 ovarian cancer. It's a terrible situation for me and I feel that I am losing all the fronts my work life balance is at stake. I can't sleep at night. Is there any way by which I can make my dad feel drowsy all the time so that he does not shout and abuse. Please help. Seeking immediate help.