Coma question please help ease my mind?

my friend just tried to commit suicide last night..he took a lot of sleeping pills and was drinking all day.. Now he is in a coma and im SO worried its driving me crazy..his heart rate jumped back up to normal and everything but i just want to know what are the chances of him coming out of this coma..Please someone help me im worried and im scared and am feeling a little guilty about all this so someone tell me what are the chances of him pulling through this... I asked this before but only got 1 answer so please help me..