Welcome Maralyn,

When my RSD spread to my right leg I had an ultrasound done to rule out a blood clot. Twice. A few months apart.

The best docs for RSD are often board certified Pain Mgmt docs or Anesthesiologists affiliated with large university teaching hospitals or in very large cities.

The RSDSA.org website has a great database of information that I found really helpful when first diagnosed.

The best of luck to you. XOXOX Sandy