SteveI don't think, unless there's something organic or pathological that might signal something else, you have to worry about dizziness after your first aerobatic lesson. I remember very feeling disoriented and maybe a little dizzy and people advised me to stick with it and it would go away - and it did. With practice, all of the maneuvers will seem to slow down for you.
Keep it up and don't give up yet.
Patty