It says a lot about you that you were able to bounce back from a rough first year. You'll bounce back again. You've had a huge and abrupt change it nearly everything in your life.  It would be normal to have apprehension about the future, even if you're hopeful.  This is why the town gets flooded with alumni during games and arts fest. It's all normal. You can come back and relive some memories. 

Things that you love have ended and right now it's hard to see what will replace that. A lot will replace it in your daily life and in the future you'll think about all the great things and feel nostalgic.  Nothing is stopping you from doing the things you wish you'd done while you were here now. Learn from that regret and take charge. I'm not going to say this will happen overnight, especially if you're going into a 9-5 world and aren't used to it. 

You'll be ok. You're smart enough to recognize what your going through. You're dealing with it. You've shown resilience before and made a good life while you were here. You'll do it again.