I know the feeling of going from big to small to smallest on the living situation, but I still have those I love and still don't have the alcoholic quackity quack to suffer with anymore. That will never be worth enduring for a bigger place..never.
Congrats on your move. You are on your own time, these days. Go at your own pace. What's more important is your health and peace and the same for your son.
I think you are right on track with his pangs of guilt or what passes for guilt for him. He seems very eager to work some sort of big favor for you two. I agree that steering clear of that stuff is the best plan. I've heard all that quacking about buying me the moon and such, and we all learn, that even if such offerings are made, there are always strings attached. The TV gets taken back when money gets tight. The car note gets forgotten and collectors come calling.
You're doing so well! Hang in there!
Alice