As a frequent and incorrigible overreacher, I can offer this: don't stop riding, but be careful about intensity. I use both HR and power, and make efforts to keep 80% of rides in Z2 for HR and below 70% intensity for power. A minimum of one off day per week. Riding solo it's pretty easy to just go out and hammer every day until I notice that I can't get my HR above 125, and the first thing I want to do after I park the bike is fall asleep.

Overtrained is a medical condition that will require months of recovery, and should be diagnosed and addressed by a physician.