I was averaging about 24-25 hours a week for 4 months when I overtrained.
8 lb weight gain, neverending fatigue, tough to fall asleep, a hr that was 20 bpm below normal all the time while riding, and I started getting dropped on every little roller around. Went from a winning cat 1 to getting dropped by cat 4s.
Took about 5-6 months to initially recover from, and about a year to fully recover.
Permanent issues: my heart rate dropped 10 bpm lower across the board and never recovered. Max hr of 210 dropped to 200, LTHR of 193 dropped to about 183, etc.,etc. Also never really lost the weight again.
Are there any diet issues that need addressing? I don't get sore very often, so when I do I up the protein (and have an extra scoop of whey before bed) for a few days and it seems to help a lot.