Applying pressure does not make it better.
The pain, espcially in knees, can go on around the clock. Generally it never starts under rest(nights) but after some work, and that must not be hard work. It can be just some movement that is repeted.
It never get better after more movements, only rest helps.
It started about six years ago. No special cause.
I can´t remember that anything special happend during that time.

Boster