What's this weird feeling in my leg?

[TongueBiter]

My left leg feels odd - kind of tight/swollen but nothing visible. I think the feeling started around my knee, and has gone both up and down. It is uncomfortable behind my knee if I bend it or crouch down but there's no particular place that hurts to touch. There is a slight noise from the joint on flexing it.

My health anxiety is saying it's a clot; the rational side of me says to ignore that scaremongering.

Any ideas?

I get this sometimes after not moving for a while. Try a gentle walk?

Yes, I have been getting up and mobile more than usual today, although my 10-3 job is fairly sedentary.