The problem with Anxiety (big A, as opposed to anxiety, little a,) is that all those wonky thoughts have the capacity to become shot-of-adrenaline, fight-or-flight, can't-breathe, moments.
I also find that... sometimes I know that things aren't what I think they are, but it's like there's two of me: the objective one, who knows this is BS, and the subjective one, who is freaking the f**k out and SCREAMING LOUDLY. And it's not always possible to ignore that screaming... especially when the aforementioned adrenaline hits!