How do you readjust to caregiving after a vacation?

I’m a 53 yr old single mother, who has raised 3 children by myself. I work full-time and for 4 years, I've been taking care of my mother who has dementia. (My siblings refuse to help in any way). For the first time in 4 years, I took a week off and went on a vacation to visit my son & my daughter-in-law who are in the Navy. (All expenses paid by them) , while my other 31yr old son (who recently left the Army) & my 28 yr old daughter (who is a nurse) watch their grandmother. I went parasailing 350ft up, horseback riding, kayaking, paddle boarding, rock climbing (at a gym), went to museums and had a variety of different foods. It was wonderful.
However, since I’ve been gone, my mother’s dementia had gotten worse. My son told me that being in Iraq and Afghanistan was a lot easier than caring for his grandma. My daughter, being a nurse, had an easier time, but she works such long hours and has a family of her own, which made things difficult. I feel bad for asking them to care for her. My children told me that they have the utmost respect for me because they didn’t realize how difficult and stressful my life had become. I now remember what I’ve been missing (I use to be very active) and it’s harder than ever to readjust to caregiving. I now have to get used to it all over again, which is extremely stressful.