Bella, I'm not single either, but I was the sole caretaker for both of my parents -- not an easy task and as patient as my husband was, I know he was feeling like he was by himself a lot. But, at least I had some respite by being able to go home and have the caretakers take over. Not that they weren't calling all the time though! Even though I didn't live there, I still took care of all the shopping, doc appts., meds, etc. (and still do even though my Dad has passed) It's not easy and there is no time in between working and taking care of their needs. I don't even feel like I've had time to fulfill being a wife.
Now here's the part I have to admit I feel bad about. about 2 years ago, one of the ladies in the office was the sole caregiver for both of her parents and she lived with them. They were so ill, but she worked and had full time caregivers and she told all of us constantly about what was happening with her parents. We sympathized, but now I know I didn't sympathize to the full extent. Why? Because I didn't really know what she was dealing with. I knew, but hadn't walked in those shoes. Now I can fully sympathize with her.
Just wanted to say that I can totally feel your anguish. It's not easy being a caregiver ((hugs))