I think a lot more than openly admit it struggle with motivation, even when it's dry and the work is there waiting, sometimes you just won't get to it.
Being self employed, people say to you "you're lucky, you can just have a day off" but we all know it doesn't work like that, as time off means no wage for a sole trader in our game, even when the bills are paid taking a break still makes you feel guilty sat at home if you could be out earning money, like you're cheating yourself.
I'd say just take a break if the bills are paid. Sorry to hear about your girlfriends illness, best wishes to her.