He would have left anyway...And as you see he did. There are food pantries for food...most hospitals will have free bus passes..there are buses for transportation and if he were going from the hospital to rehab, rehabs usually come get you. At least in my experience.
Sounds mean but theres nothing you can do for him. So let him do what he has to if he chooses to get high and same goes for if hes ready to get clean. Love from a distance and take care of yourself. never make this your problem.
Because us addicts are masters at making people think that.
Worst thing to do is enable an addict. My life story and what kept me using. What reason is there to ever change if theres always someone else bailng you out.
Good luck