Honestly sleep is probably a good idea. I know from my personal experience some of the worst feelings at least mellow after a decent night's sleep. We can be clams together! ^^/
Try not to let it get to you easier said than done I know It's not surprising that you feel 'disconnected' from everyone. I mean, you've been physically gone from their lives for quite a few months right? You're not going to be up to speed with everyone and involved with them until you have some time to reconnect. That doesn't mean they don't care or didn't think about you at all. It's just part of a loved one not being physically around. I'm confident you'll meld back into the rhythm of things soon ^^b

haha! No don't worry you're not the only one to suffer from the jealousy monster. I could only laugh as you described your feelings of irritation at the mention of people's names that are close with your friends. It's so true! I've done that exact thing orz
Friend: "Oh you know so-and-so? We did such-and-such together?" Me:"You did WHAT with the devil!???!!!!" It's really just pathetic really OTZ
Ganbatte~ You're in a full boat