I encountered the same problem my first year of college cross-country. My times started going backwards by mid-October and I left for X-mas break feeling beaten up and discouraged.
I blew off my holiday training program for the first three weeks and didn't even think about running. When I came back in January, I felt refreshed and ready to go and was actually running well again. Sure, I had lost some training, but I guess my body wasn't ready for it at that moment. After some rest and recovery, I was able to start escalating the mileage again, and by sophomore cross-country, I was stronger than ever.
The lesson, for me, is that despite whatever your training program may say on paper or what other people are doing or think you should be doing, you have to listen to your body and give it a breather on occasion.
Given that you are in the midst of the season, there may not be much you can do for another six weeks or so other than try to take a few days off. At the very least, make sure you are running easy on your easy days, and try to replace a hard day here and there with an easy day.