I also suffer from Pars Planitis. There are a few treatment options available. I have been on a drug for the last 6 years, that has really helped to stabilize my inflammation.
http://www.uveitis.org/pp/default.htm
this is a link to the best Doctor to help deal with Pars..it contains a forum so you can ask questions, but also very useful website for general pars planitis information. I hope this helps..
There are a variety of systemic medications (take by mouth, by injection into skin or muscle, or by IV) that are used in pars planitis. Your ophthalmologist should collaborate with a rheumatologist to explore other options for you.