T.S.
I hate to say it but this is really a women's issue.
Men are like this because we allow it.
I used to be the same way, I would suffer through and deal because in my mind the kids and the house needed more attention than I felt I needed to give myself.
No more! It took me years to realize it but if I am not feeling well I WILL take a time out, I WILL go to bed early, I WILL let the husband and kids fend for themselves, period. So what if the routine's upset and maybe things don't get done exactly as I would have done it? I'm so over it, lol!
There's no reason you can't go to the store, the kids can watch TV with daddy, and they can "take care" of him while you're gone :)