Doubt is good. It means you're being introspective, that you're not resting on prior knowledge (that might be invalid now), and that you're honestly weighing the situation instead of employing blind optimism. Doubt is healthy! Hold onto that.
Will any of this make you feel better? Probably not, because feelings are emotional, not logical. If I read this list back then, I doubt it would have "fixed" my worries. But maybe it helps to know that this is just how it goes.
So listen to the expert bloggers; they have great advice. Just filter their attitudes through your own lens, and remember that they went through this pain too