You are doing great!!!!!. Come here, in addition to talking to your mom, any time you feel your grit 'waning.'
I would make a suggestion though for your vacation. Not knowing how far along he is in his addiction, before you go, remove anything of sentimental or monetary value from your house and put at your mom's until you return, otherwise those things may be long gone and sold. That is just an addict's way.
And he doesn't have to go hungry. Since he isnot working, and 'disabled' he can go to the food banks and he can go to Salvation Army or the nearest 'Rescue Mission' for a hot meal every day. OH and BTW Salvation Army has a wonderful FREE rehab program.
My rayers are with you and your son. Have fun in Branson!!!!!!!
Love and hugs,