I'm sorry to hear how it ended up but your emotional state concerns me a bit. I'm no doctor but from your initial descriptions I'd say it seemed fairly bi-polar. The highs are high, and the lows are like scrape the barrel low.
If you still feel this way after another month or so I would advise (as a friend would advise someone he notices acting this way) that perhaps he should talk to someone professional about it.
As for moving on a bit it will be difficult, best of luck and try to occupy your mind with hobbies and other friends and you should find it getting easier day to day.
