Nana,
I'm glad to see you. I think you should take this time to yourself. He is being taken care of right now and this is a good time for you to rest.
I also think that maybe you could look into another placement for him to have his health needs cared for. I think you've drained yourself to the point that you may not be able to do it anymore.
It's hard to love with an extreme burden that goes along with it. Don't feel guilty for the way you feel. Most anyone would feel the same way in your situation.
You take care of you right now. Only you.
Hugs,
MG