Ok so you raced a 5k close to a goal 8k and then followed that up with an aggressive mid-season workout. It should be impossible to run "several" 1ks at mile pace on little rest. So at the end of that you're all just hammering k's to exhaustion. It makes no sense.
You should be peaking for conference/nationals. The two weeks in between is about riding that fitness out. Proper recovery after the first race. 1 more workout to stay sharp but making sure not to overdo it. 1 race week workout. I would do even a day off after the conference meet then easy mileage for a few days. Thursday or Friday do a last real workout. Maybe something like 8-10 x 1k @ 8k/10k. That's a workout you've done earlier in the year but easier to recover from than 1600-3200 reps that you've built to. Race week Tuesday or Wednesday something like 4 x 1200 @ T (read: slower than 8k race pace by a good bit) + 4-6 x 200 @ mile/3k. Some like shorter/faster reps race week: 2x1k, 2x400, 2x200, all getting faster. That's fine too.
You just had too much quality crammed in. 3 races in 3 weeks plus a workout to exhaustion after race #2 plus however many other races you had over the course of the season. It's too much.