Doctor this morning i got up as usual, and was some un-balanced. drove doctor slow but ok. walked to doctor little unbalanced but ok. she thought i had a allergy gave me prednisone and dizziness and nausea meds, and also drove 100 mile trip next day?

Not clear to me if you are now saying that you recovered and can safely drive long distances. You may have had some allergic issues, but at age 73, there are other problems which are potential issues, such as TIA's, cardiac problems, anemias, hypoglycemia, dehydration. Hopefully all of these were ruled out by thorough evaluation. If unsure, schedule virtual consult on HT paid site.