Well, look - you were ran regularly for about a year. Then you took about 5 months off for an injury. Then you started up again and almost immediately launched into half-marathon training. But after that layoff you were basically starting over, so yes, you will be slower. It will usually take at least as long as you were off to regain your fitness for both endurance and speed. I think you just haven't given your body enough time to get back into shape and you've been pushing too hard - basically over-training. (Plus, of course, the warmer weather will cost some in both pace and endurance.) Probably the best thing you can do these last few weeks before the race is back off, don't worry about the speedwork, and just put in the miles. Pretty much what shipo suggested. And make the long runs true LSD. Run an 11:00 pace or even a little slower, but mainly do them comfortably. Give your body time to recover. I think you'll be fine for a 10:00 pace in the race. After the race go back to your typical training. If it includes speedwork, start at that 9:30 pace or so (whatever seems do-able) and work your way down over a few months. Take your time, you'll get back.
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