First of all, stop panicking.
Most of us will remember how we felt on the run up to our first half marathon, or first race for that matter regardless of it's length.
Personally I wouldn't have done the run with a week to go, but I can understand why you did, as you probably wanted to prove to yourself that you could do it. You are probably aching because of the run last Sunday. If I were you I would take it relatively easy until the race, maybe a gentle jog/ run or even swim just to keep your muscles supple. Anything you do between now and Sunday won't make you any quicker, as you've done all the hard training already.
Most important of all believe in yourself! You've only had three months for your first Half Marathon and that is something to be really proud of, especially since you did it in 2 hour 30 mins on Sunday. Just think what you can achieve with all that adrenaline and race supporters on the day 
With regards to the hill, think equal effort not equal pace. It also sometimes helps to break it down into chunks. For example if there are 10 lamposts going up the hill, just focus on getting to each lamppost at a time, rather than the whole thing!
Enjoy it and let us know how you get on, you'll be hooked