Tension in hip flexors/quads

I'm pretty certain this is a PD symptom.

For a year now I've had really bad tension which seems to start in my hip flexors and go down my quads to my knees. It only really bothers me when I'm sitting at a computer (like now!) but since my job is computer-based, some days are agonising.

I'm not sure if it's restless legs - I don't get it any other time. Sometimes doing a bit of stretching helps but only for a few minutes. Today I really need to use the computer but it's almost impossible to sit at it for very long.

Anyone else get this? Any solutions?