Welcome lonelyone, WOW, only 27. I am sorry your life has been nothing but pain so far. It really is hard watch someone you care about struggle.
I had a hard time understanding your post. I know English must not be your first language.
I can tell you are very concerned about your friend and you have limited options.
I think you need more practicable advice than trusting in God's healing.
Hopfully your friend can get professional help to realize life is worth living. Rebel is right- give your friend a listening ear but go easy on the God stuff.
If he was a JW then, he no doubt feels unworthy of God in this life and may think if he kills himself he will wake up in paradise.
I repeat he needs professional help.