- those who walk around in glass houses shouldn't walk around naked.
Not walking around in a glass house. Horses are bigger and stronger and faster than you, and they can think AND they'd rather eat than work. If you lived close to me you could pay ME and I'd fix your horse's problems.
It's easy to be prideful being around horses. People are emotional, and horses are emotional. Sounds like a romance novel. I have broken in several horses, retrained many more and trained 15 to be fearless around traffic, gunfire and cannons. (Retired from CW Reenactments, including the big, national events.) I've also been thrown and only broke my humerous after being thrown 9 ft. In the air. It was a small horse, btw. Falls and breaks are inevitable around horses. BUT, if you haven't trained one, you need help! Your horse probably weighs 900-1,000 pounds and could kill you if cornered and frightened by you. That SHOULD give you food for thought.
We get many posts here about horses that are beyond the training ability of the new horse owner. We also get the stories of their accidents. You asked for help, and nobody here can give you blanket advice without being there to see the problem. I noticed that you didn't tell us that you have years of horse training under your belt.
"Bit" advice can be given if someone is trying to finish their horse, or prevent head tossing, or get better collection. A bit will never stop a horse, or else nobody could ride horses bitless. A well trained horse WILL stop on a simple snaffle. I still school my 7yo geldings on a snaffle. My big head, left is 16'3hh, THAT means his withers are 5'7" and his back is a few inches lower. I am 5'4" tall. He's a big, POWERFUL horse, and I've worked hard to gentle and train him to behave.
Perhaps you'd like to post a different question?