Hey Janmarie,
I can understand where you're coming from. I had a similar experience, thankfully I wasn't driving or officially in EMS yet. I was making the switch from my old job to EMS though. One evening me and my roomates, (now partners) were at a get-together, no one was drinking. At first I was fine, then I started having issues focussing. From there I was lightheaded, my heart was doing jumping jacks. I hate being the patient so I just sat still , got quiet and hoped it would go away. We went to leave and I had to hold onto the wall to walk. I admitted to my roomates that I didn't feel too great. To make a long story short I didn't get better at home and my partner ended up taking me to the hospital after I couldn't make it down the stairs (they also decided I was altered, which I could have sworn I wasn't). The doctor did a basic neurological assessment, you know, touch your nose type of thing. I had blood work done, but nothing remarkable came up. It was scary, but all I can figure is that I must have been really stressed and that was my body saying that it couldn't take it anymore. It hasn't happened to me since, but I would strongly recommend that you get thoroughly checked out, or else you'll be left wondering if something is really wrong.