I am an engineer, married and having a daughter. me and my wifeis suffering from mental genetic disorder which

First of all, BE A MAN and stick it out. Don't you love your child?? You married the woman and have a child... take care of your family that YOU created!! Abandoning your child and wife is the coward's way out. If you don't want to have any more children, get a vesectomy. Be a good husband and father or you'll regret it.