Join Date: May 2009
Location: Mid Northern TN
Start back at a walk. Ideally bareback/bareback pad, but at least without stirrups. If you fall when you lose them, it means you're relying too much on your stirrups/feet for balance anyway, which, unfortunately pushes you out of the good seat you would like to have and makes it MORE likely that you will lose your balance, lose your stirrup, and then fall anyway.
So go without. Get comfortable walking, stopping, backing, doing circles, playing around the world, waving your arms about, etc bareback. Once you feel good with that, start introducing trotting again. At first, maybe only one trot stride and then back to walk. If you can get some bareback lunge line lessons (like the guys at the Spanish Riding School do for years) they can be a GREAT chance for you to focus on your riding and the feel of the horse without having to worry about where/how fast or him listening to you or not. Your instructor does all that an all you have to do is focus on doing what YOU need to be doing to learn how to balance well.
Good Luck, and relax and have fun! :)