Because of the injury and the fear you are carrying around, I think you can't rule out a panic attack. I think more baby steps, other forms of exercise that you feel safer doing, and more time are in order.

The fears you have about not being able to regain your fitness are totally without merit. You can get it back and your bones will heal and you'll have fun on the bike again. You seem to have really good insight into your thought processes and the fears. Trust yourself.

Karen