Welcome to the club

O.N. will seal the deal, that's for sure.
(nice to hear of another who had O.N. show up after 'vague' symptoms of MS... which is pretty much my case as well, though I had met the McDonald's criteria for the diagnosis originally, prior to my O.N. showing up just this last week).
As others have said, sucks to 'welcome' or congratulate in any way the diagnosis... but when one's waited so, so very long for a 'name' and closure, it is something to be congratulated if you ask me. At least in my experience, it was a HUGE relief.
Here's to healing and you know you have us and I hope too a great immediate support group or network.