(((((washbe)))))
As stated several times above. Be very clear with his nurses and his doctors about his home living situation and how very unsanitary it is. If they cannot get HHC then in all likelihood they will find him a Rehab Nursing home where he will live and be taken care of for the 4 to 6 weeks until the valve replacement can be done.
And after the replacement he will again be in the hospital for a while and then probably back to the Rehab Nursing Home for another 4 weeks or so until he is healed and infection free.
Maybe, just maybe, with all of this happening to him and he will have been clean for a while he may become willing to get the help he needs for his addiction.
Continuing to send healing thoughts and prayers for you and your son.
Love and hugs,