Diva, what about giving yourself one period off per week, maybe one evening, or one day at the weekend, so that you can have that time to look forward to ? Also then you know that you are 'allowed', so hopefully shouldn't feel guilty about it. You really can't work 24/7, its not good for anyone !!! If you really, really can't manage a complete day, what about a nice long lie in on the weekend ? And don't underestimate the power of a good nights sleep !!! I think its one of the very under-rated things, but so very, very important.
Quite often when I'm really stressed I will have a sleeping tablet on a Friday night so that I sleep well and don't have to get up so early on a Saturday. I find that I really look forward to that all week, and don't have any hang ups about it as I only take a sleeping tablet that one night of the week. What a difference it makes !!! Good luck Diva