you have a complex situation and definitely need some answers. The fact that you are driving and having an episode that compromises your consciousness is very scary. You shouldn't be driving if there is any question about your performance behind the wheel. A good examination by your doctor and neurologist are a must.
While your description sounds like it could be a partial seizure, there are other conditions that your doctor would have to look into as well. Anxiety can mimic anything, from what I know, and TIA's are a neurologic problem that you could ask the neuro about. I would guess you might be getting some further neuro tests, like an EEG done, and/or other tests based on what you have said about your symptoms.
I was on a beta-blocker, propranolol, for a number of years, due to tremors from my anticonvulsants. It also did wonders to control symptoms of sweaty palms, rapid heartbeat.
Keep us updated on what's happening. Glenda