Hey. You asked me on the reply what could you do for sleeping and stop thinking about it and stuff in the meanwhile I couldn't reply to you in a message because you are anonymous so I'll just reply here and if you want further advise you'll have to message me as none anonymous or post a topic on the serious forum so I can keep replying without making lot's of replies on the ehelp system (If you do this just sent me the link when you reply to the ehelp)
I'd say just try to do relaxation exercises before going to bed or when you are too stressed, sad, etc.
Things like being outside, doing breathing exercises, running, yoga, inhaling and exhaling, etc; work a lot. They take your mind out of those things that make you feel so overwhelmed (most of the times.)
Things that make you generate endorphins are essential because they make you happy; sport for example!
Also do things you like! What are your hobbies? Perhaps photography or so? Could you take a course? go to a camp related to something you like? - Doing curses and things like that make you happy sometimes and also could help you to meet people.
Before bed, read a book instead of perhaps watching tv or having the computer on (Those things won't let you sleep! Because your mind is too busy finding things to do so at the end it just doesn't stop and it awakes you).
Take a hot bath and drink a tea; that could also work!
Start making planes about what you are going to do to get out and meet people and just take it day by day. Rome wasn't build on a day and friendships won't either but you'll never have them if you don't start. You'll need to meet people and start networking but just keep your mind open to possibilities and you'll succeed. I'm pretty sure there's lot's of people waiting too meet you if you just give them the chance.
About food, what kind of problems are you having with it? Did you just loose your appetite? - I'd need more info before trying to comment any further but in the meanwhile I'd just say try to eat healthy, set a schedule and don't miss it. Don't stop meals and perhaps eat pastas and things like that, mix it with things you enjoy.. again if you start exercising that will make you hungry so that could also help you.
Good luck!