I sometimes have doubts, because my AS symptoms are relatively mild. My other problems like depression are much more obvious. Ultimately, I think that nobody knows exactly what AS is. They know all the symptoms, but they do not know what the cause is. There is no reliable diagnostic test (yet). There is no real treatment. So, it really does not matter too much whether my self diagnosis is correct or not. I certainly seem to fit in with people with AS, and that is good enough for me.
Really the only reason that I care at all about whether I really have it or not, is that a formal diagnosis would let me talk about AS publicly, and a formal diagnosis might provide some useful input.
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"Like lonely ghosts, at a roadside cross, we stay, because we don't know where else to go." -- Orenda Fink