I've very recently developed driving anxiety. It's whenever I'm on a motorway and needing to go fast. I become aware of the speed and have a very sudden feeling of terror and I have to apply the breaks, then it passes and 10 minutes later it'll happen again and again. I can now only travel at about 60mph max which makes long journeys very slow; yet still unnerving and stressful. Have you had this and Is it curable?