I have a routine day job and a part time night job which I do from home on contract basis. I had vacation from my day job last week, because I have a sweet union job and get loads of vacation so some of it is just hanging out at home, but it's AMAZING how job 2 expands to fill all that time, as well as every errand thing I have no time for, like haircuts. And my dork assed loser ex I still have to live with is like "well you can get these things done while you're off". I'm never off. Never ever.
Ugh that sucks. Is it not an option to drop that additional responsibility? Just say you can't because of "prior obligations" (taking care of yourself)?
I find empathetic people are often the worst at letting things break so they can have one.
Not that I fully know your situation, so pardon my perscriptivising.
I do "productive vacations" mostly too, but sometimes you need a real break. I'm not even talking about going anywhere, but giving yourself time to just laze about and read and make meals and just do basic tidying, or whatever.
I don't even have a paying job right now, but I can't wait until I do, so I can take a week off to actually relax.