I would highly recommend seeing a functional medicine doctor as suggested. I finally went to one for other reasons and she tested me in ways other doctors did not, But functional medicine doctors look for the CAUSE much better than traditional doctors and they are very familiar with testing for inflammation. There is a website - ifm.org - institute for functional medicine - and you can search for one by city and state. Each doctor on the site has a bio and a list of conditions they specialize in.
Good Luck to you - not easy at all dealing with a long term problem that impacts your life!