Good job sticking with it after the scary windy encounter! Just chalk it up to experience and move on with your new knowledge: your horse can feel if you're nervous, too spunky of a horse may not mesh well with you currently, screaming never helps anything with regards to horses.
And don't necessarily omit Arabians just because of this one horse/incident. When you do look for your dream horse, just look for one (any breed) with a calm demeanor who's experienced a lot of things. I'm sure he wouldn't even need to be as old as 20. Many horses who have lived at very busy boarding/training barns get to experience so many varied things that they could care less about any crazy sound or sudden movement.
Good luck (you can
get over the screaming thing!) and have fun horse-shopping!!