Perhaps. Seems like everyone is different with respect to their tolerances for (over-)training.

Around the end of August last year I suddenly became very fatigued, so much so that I would be exhausted after a relatively easy ride. I had really ramped up my training that spring & summer and, after I saw my Dr and had some tests done, best as we could tell it was my body telling me "enough already". I ttok a couple of months off and felt much better by December. Now I'm a lot more careful in how much I ramp up, and I'm better at recognizing the signs.

You might consider cutting back on your schedule for a few weeks and see if that helps. Also, if you haven't had a checkup in a while, it wouldn't hurt.