One thing I've had to learn over the last couple of years of highs and lows (an agent requested the full! Squeee!!... The agent "loved it but not enough" and rejected the full. Major frowny face...), is how to push through the lows. I've had to figure out how to keep motivated to write, to keep going forward, no matter what kind of day I've had.
Everyone has different ways to cope with roadblocks, or rejections, or whatever else may get you down. Is it going back and rereading the email from your friend/hubby/crit partner who loved your writing and gushed about it for three paragraphs? Do you turn on your favorite song and belt it out at the top of your lungs? I'd love to hear your ideas.
For me, different things work on different days. Over on Elana Johnson's blog, she asked what makes you giddy, and it got me thinking about one thing that works pretty well for me. I love singing -- particularly in my car. I love turning up an amazing song and belting it out. (I can pretend my voice is as good as the person I'm singing with that way!) One song that seems to help me feel better is from WICKED called Defying Gravity. (Oh, how I love that musical!) Sometimes, it feels like hitting some of my goals is about as difficult as defying gravity. I love powerful music, and I think that is a gorgeous song, especially when I'm needing a boost. "They'll never keep me down!" Try it sometime.
Or for the sake of my children's ears (and those of the driver's around me), maybe you should tell me what your ideas are. :-)