welcome to sr, i'm glad you found us too. there are a lot of caring understanding mothers, and others, who want to walk through all of this with you, you are not alone here. my husband and i both are recoverying addicts. yes it can be done, but it will depend on the choices that your son makes for him self, there is not much more that you can do to help him. now maybe its time for you to take the focus off him, he's in good hand. turn the focus onto yourself and begin to do what you can to take care of you.
it is suggested here that you attend at least 6 alanon or naranon meetings for you, find one that suites you, they are very helpful in learning coping skills, also the book "co dependant no more"/ melody beatty is a good read. keep posting and reading here. keeping you and your son in prayers.