I've Been Driving All Day, 12 Hrs, I Smoke, I'm

I've been driving all day, 12 hrs, i smoke, I'm 38 yrs old, and I felt fine all day. As soon as I got done and had one cocktail, my veins in my neck started throbbing and I feel like the blood in my body is gonna burst out of my skin and my heart is beating g really HARD. Not fast though. Just hard. Is there anything g you can't tell me about this?