Let me explain what we really know about autoimmune disorders.
Our language has this goofy magic-mystic separation between "mental" and "physical". Reality doesn't. The chemistry and electricity and neurology of you is every bit as physical as your blood and bones and it's all intertwined and all of you from the neck down participates in what's happening from the neck up just like everything from the neck up participates all the way down to your toes.
And autoimmune disorders are most crazy-common in people who are survivors of trauma currently living under conditions of stress.
Y'know, the same people at highest risk of their brains trying to kill them. (Which isn't actually that surprising if one understands that everything is physical and intertwined and that the leading current evidence is that depression itself is just another trauma-catalyzed immune disorder.)
And what we're pretty consistently seeing--
which, again, makes perfect sense when one thinks about it--
is, if you survive that particular disease, and keep on trucking with your trauma and your stress...
...sooner or later your body is going to try to kill you again.
By middle age, I had survived two life-threatening autoimmune conditions... so far. Three if they are right about depression.
This isn't freakish, or bad luck, or even unlikely.
What is unlikely is that I will get through the next ten years without it happening again.