Sounds great. Get used to those big swings in hope, mood and everything else. The valleys are deep, my friend. Sometimes the smallest thing can just knock you off your feet and you sit wondering "how the hell could that be making me feel like this?". Just remember that the peaks come back. Don't get swallowed up by the black pit and give up because of it. I know it feels horrible. When I'm like that I go for a run. Exercise is a wonder drug (and ice afterwwards!). I've said it before, I can feel the whole world is falling apart and after a run I come back counting all the blessings in my life. Strange but true. You'll find something that does that for you. Hang in there.
