Next time they talk to you about it, you need to stop letting them bully you. They might be your parents, but that's exactly what they're doing.
Your physical health and ability to walk is
way more important than football. Tell them your not going to idolize a game and put that above your health. Loyalty to a team is good and all, but no matter how you look at it, it's just a game and no team is worth your life.
It's ridiculous that they would put some sport before the health of their own kid, and then hurt their relationship with you because of it. Seriously, don't let it end there. Refrain as much as you can from letting yourself get angry or emotional, but you need to tell them how it is.
Ive been to a doctor who has sent me to the Physical Therapist
That's not really Dooble's point, he meant that you should try to get your doctor to tell your parents how serious the injury is. If they think you should play football with a screwed up back, they obviously have no understanding of how serious your injury is.