Do get that other opinion, and another if needed. I am sure there are things that can be done to help, from the best of ankle-supportive shoes to exercises (never believe that exercise won't help, it won't cure, but it will build strength and more flexibility--you'll need to find out which ones are the right ones to do)---your parent's reaction was trauma enough...
Try to see an orthopedic doc.---let him/her know you can't afford surgery.
Best to you & let us know how it goes. Don't give up!