Dear Annie: I am the sole caregiver of my partner of 30 years who started suffering from dementia five years ago. I am at a point where I do nothing all day if I can avoid it. I read compulsively. I start stressing days ahead of when I know I’ll have to make a trip to town -- 40 miles roundtrip for groceries, etc. My partner doesn’t require me to be on my feet all day. He just lays in his chair…