GWB was at least rational. I don’t think Trump is. I think he’s a thin-skinned narcissist / sociopath without human empathy or boundaries, and one who does not respect the separation of powers of the Federal Government. GWB didn’t make a white supremacist his chief adviser. Trump makes GWB seem quaint by comparison. Freaking out, and continuing to freak out is entirely warranted. Calls for calm like yours are how we got Trump in the first place.
(I agree about working on supporting progressive candidates for other elected office, but that is not mutually exclusive to an entirely warranted freak out over Trump.)