Hello and welcome! I am sorry for what brings you here.
It is creating anxiety b/c you have no idea what is going to happen next. I totally understand, been there. It sounds like he needs to be a lot more involved in his own recovery. You made him a doctors appointment right away after he relapsed. It really should be him making the choice about what he wants to do about it. I know it's not simple b/c it affects you and your family, however that is the only time recovery actually works.
I have heard and said on here many times b/c I think it is wise. Prepare for the worst, hope for the best. I suggest to you that you also need therapy as support for you.
Please keep posting, you are not alone.
XXX