So concerned for my (lost) son

I have a 17 year old son who has been pulling away from the family for about 6 months. Just recently he quit his job of over 1 year and is failing out of his senior year. I know that he is very angry about something but he doesn't like me and refuses to talk with me. I tried raking him to counseling the other week, but he didn't respond. I know that he is using some drugs, but I'm afraid the problem may be bigger. He is sleeping hard in his bed and I took his phone. For some reason his screen isn't locked and I could just look at everything. I just read things that are so concerning. Please pray that whatever my next step is, that I have the strength to take what he says to me and that he will get the help for whatever this bad thing is he's dealing with. Please pray that I stay strong and don't break down in front of my other younger son.