You can work until your fingers bleed, but that won't give you a sense of pride. You can cry til you can't see the sky, but nothing will change until you're ready to try again. Sometimes, doing something too much is worse than not doing it at all. Like everything else, it's all about balance. So, for your sanity's sake, take the time to find your limits, and listen to your body when it tells you to take a break.