ASS is such a frustrating disease, especially since there is so little information available and so few protocols. We are all really winging it and hoping for the best. I feel I have been fairly lucky so far but it has been a long journey.
In midMay 2009 I was feeling short of breath, tired and achy in the joints. Within 6 weeks I was hospitalized and down to 33% lung capacity. Eleven days later I was diagnosed with ASS and began immediate high dose prednisone treatments (250mg, then 80 for a month, then 60 for 2 months, 50 for 2 months, 40 for 5 months, 30 for 2 months, 20 for 2 months and am now holding at 15mg/day). About 3 months into treatment we added Azathioprine/Imuran (100 mg/day) and NAC 1200 mg/day (an amino acid supplement that helps the lungs).
I have slowly and steadily regained my lung capacity and when last checked in April was back up in the 70% range. My lung efficiency is still lagging around 55% but slowly improving too.
I am no longer dependent on the oxygen concentrator and am just using a portable system when out walking or exerting myself. The hardest parts of my days are contending with the medication side effects. But finding various helps for those here and there.
You might want to see your test results and find out what sub-type of ASS you have (PL-12, PL-7, KO, OJ, etc) as that may help guide your treatment choices and help you when looking at some of the research. That information should be on the results for the Myositis panel they would have run to get your diagnosis. I have the OJ subtype, which seems to be about 2% of all ASS diagnoses and generally has lung involvement only.
It has been an arduous journey, but things are getting better. I hope you start to see improvements soon.