Kevindale thanks so much for this reply...
Yes, I've been having trouble sleeping and I've been sweating more than usual.
And the weather is certainly warmer now than say 2 months ago but I don't remember these symptoms last year...
When I say I feel overheated i mean my skin/muscles feel very hot. It is a very unpleasant sensation. I have intermittent chills also, strangely. I sweat like crazy. My forehead feels like it's burning. I feel tired but I'm restless. This feeling doesn't really start until about 20 mins after I get home from ride.
I'll make doc appointment...