I know how that is. I hate poping out of bed and going anywhere. It doesn't matter where it is I get those exact feelings minus the sweaty hands. I get sweaty feet. When it happens to me, and it happens a lot if I have to travel to another side if town. I turn my AC up as high as I can, get at least one vent to blow in my face and take deep breaths. If I don't do that I need to park. If I don't calm down I take back roads home and I don't care how far out if the way it is.
I hope you've calmed down from it all. I know how scary it is. I don't fear the death part and I don't feel like I'm gonna die. I fear I'm gonna get sick which to me is worse than death
Like SC said at least you made it through it.