The epinepherine causes your blood vessels to restrict so you stay numb longer. I was given something without it for the same reason as you. My heart did not race but I kept getting un-numb, so he kept giving me more. I felt very sick afterward. He was putting a temporary crown on my # 12. When I went back and had the permanent crown on, he only had to get me numb once because it was a shorter procedure, but I had a even worse reaction and went in the next day for him to see how my eyelids were swollen. That was last Fall and now my left sinus has enlarged, I snore worse, I am allergic to my skincare I have used for years. When I go out in the sun, my cheek swells and turns red. My short term memory is getting worse. I'm very concerned and am not getting any answers. So, my advice to you is to go to the oral surgeon and let him put you under.