You're a saint! My brother was living with me, the last time he fell down and I didn't know until an hour later, I made the decision that he need more care than I could give. I didn't have the resources or proper equipement. I talked to him and he agreed that he was scared and wanted to go to the hospital. I called an ambulance. That was 3 months ago. He is now in a long term care facility, he feels better because he does not feel like he is a burden, I feel better because alone, I could not give him the care he needed, even though I had help coming in once a week. Doctors were able to provide a medication cocktail that made him more confortable. He seems at peace now, and I am always bringing him 'goodies' and homemade meals as best I can, which he enjoys (when he is not nauseous). It was the best thing to do for both of us. I felt tremendous guild for a while, but with the support of family and friends, they helped me realize this was best.
The worst thing you can do is burn yourself out. Take time to understand the needs and if you cannot accomodate - it's o.k. That is why long term care facilities exist - you just have to do some homework to ensure the best possible care - and visit as much as possible. Remember, you also have an obligation to take care of yourself and your family.
All the best.