I Have A History Of Panic Attacks. I Just Had

I have a history of panic attacks. I just had one last week while driving. I haven't had one in 3 years because I have been on Sertraline. I wonder if they are really panic attacks or maybe low blood sugar. The one I had last week was continous shaking for about 5 minutes. I didn't need to pull over, I was able to breath thru it.