I'v found two things which are definitely related to my foot/ankle pain.

1. Mental health: When stressed I sleep in such a tense way that if I don't keep my finger nails short I can puncture the skin through clenching my fist. If I can manage to sleep 'uncurled' my feet are better.

2. At my last increase one of the first things I noticed was a marked reduction of foot pain/dystonia. This is confirmed by a return of pain when the med. levels get messed up due to cocked-up timings, over use of laxatives etc. In fact I now know that a sudden worsening of symptoms is due to fluctuating drug levels by four markers. Increased urinary frequency, mild dyskinesia , increased foot pain/gait disturbance and plummeting mental state.

Of course this may only apply to me.