You've gotten some good advice....
I know how hard this is(believe me...been there, done that....too many times)
unfortunately if you rescue him and prevent him from dealing with this latest crisis another will eventually surface (they always do...) and he will not know how to handle it nor will he have the safety or support of a rehab setting...
stay strong....let him know you are praying for him but taking him out of rehab is not an option...
you are in my prayers