If need be, you can also leave your vehicle there and cab it home, or have someone could give you a ride? (An ambulance would work too of course)
I wouldn't mess around with a fast heart rate. Please get to a hospital.
My fiance and several close friends are co-alcoholics. We actually had a long talk about it Friday night, my fiance had only recently opened up about to talk about her drinking. They are at a place where they aren't ready to quit but want to cut back. I know they probably can't, but it also motivated me to give getting sober another serious shot. The potential life and death implications of drinking not just for myself but my loved ones really hit home.
Let us know how you are