Hey take a deep breath and try and relax for a moment. You're going to kill yourself with all this stress. You're going to do as much as you can for school and give it your best effort. Succeed or fail the important thing is that you gave it your best effort. It's hard to stop procrastinating so don't beat yourself up over it, just try and not do it in the future (I need to do this one too). You'll help other people out eventually, and its easier to help other people than yourself cause you have the luxary of being objective, but when it's yourself you're right their in the thick of things and it's harder to be objective.

As for your worries, they're valid...well most of them. Try to figure out if what is keeping you awake is realistic or not. Yes moving in with someone is a big move, and it'll take work by both you and your friend to keep things going smoothly. I don't know why you feel what you do, that's you. With your vacation though which are you going to regret more calling him or not calling him?

I hope you can relax soon. Best of luck. *sends lots of calm vibes your way*