I am guessing that you will probably be put on an immune-suppressant like Enbrel. Anti-inflammatory drus are so hard on the GI system, and these TNF blockers are the only thing I know that can actually stop or slow the progression of Sponyloarthropathies like AS. I have Sacroiliitis, which is in the same family, but the inflammation is in my SI joints. I am told it may progress to my spine and my diagnosis would change to AS. I haven't tried Enbrel yet, but my Rheumatologist thinks it's my only option at this point. I have developed a severe allergy to all anti-inflammatory medicine. I have injections for the pain, but they only help hide the symptoms. Enbrel may actually help the disease.
I know it's really scary at 1st b/c there's so much you don't know yet. It sucks, but it is what it is. Hopefully you'll find a great doctor and the right treatment. Best of luck.