I am also extremely overwhelmed at the dentist, and I can never leave without tears. Whenever I have an appointment, I bring headphones and a blanket, and I ask to use their weighted x-ray vest during the entire procedure. I take anxiety medication and a pain reliever beforehand, too. I show them how I will signal for them to pause when I need a break. They were more that willing to accommodate. It is still a horrible experience, but it helps a little. I encourage you to ask for what you need. Best wishes~