Blood tests,blood tests and more blood tests,exrays scans you name it,keep going to your doctor they will have your back,dont rely on just one specialist,get a second opinion,or a third or forth,dont give up as it can take a long time to diagnose. I personaly took photos of flare ups etc as whenever i had any appointments with specialists,it was always a "good" day. For nearly 2 yrs no one was interested i my photos,but now they ask for them,and 2 soecialists said ghere was nothing wrong with me and i was too active fir my age. (Never heard anything so rediculous and demoralising) after diagnosis research and join groups with your condition, ask advice even if you think its a silly question,dont be embarrassed,they have already gone through what your going through and are happy to try and help.dont think "iv tried everything and nothing works" there will be something out there that will soothe (not cure) your symptoms.