Experienced 2 sore knees today

[SeaBoat]

Something strange happened today. I was going about my day i started to experience 2 sore knees. They are sore whenever I bend my legs for sitting down and for standing up.

Not only that I have a stiff lower back and a feeling of not being 100%. I'm OK. The knees are so sore though.

I took my temperature but there's no fever.

I am experiencing aches here and there, on and off all over - visiting aches in my lower legs, thigh, arms, neck, boobs - along with some stiffness in the lower back. The aches are not in all the time.
I don't have a fever and I don't feel flu-y.

I feel OK aside from the aches.

Any idea as to what this could be?

Last time I had something like this, I was brewing a big respiratory infection (not Covid). Initially I actually thought my hip was trying to dislocate or something similarly painful and was trying to stretch everything out. Then it spread to other joints, then finally a fever, headache, chesty cough, sore throat etc.

Dose up on paracetamol and see what happens?