After 10 years in EMS - the last 7 as a paramedic, I had a similar injury way back in 1985. My advice to you is to take a long view. I attempted to return to work way to early - and the aggravation to the original injury ended my career. I really loved doing my job, just like you. 25 years down the road, here is my advice:
1) As I said, take a long term view. You have to live with your body for the rest of your life. No matter how much pain you have experienced, it can get worse. I have had to deal with increasing, severe chronic pain. In recent years, I have become disabled as a result of it. After loosing function in my left leg, I had the first of four surgeries. Function improved, pain got worse. These days a neuro-stim implanted in my spine and 4 different daily meds make life bearable - but I can be active for only about four hours per day - on my good days. Please put your body first - after all, jobs change - but your body will be with you for the rest of your life.
2) There is life after EMS. I went back to school and became a minister - I pastored churches for 20 years, and even now I serve as Chaplain to a Civil Air Patrol squadron when my body lets me. I also ran a computer business for several years. Now that I am "retired" I get to spend time with family and especially my grand kids. My primary care provider is a former paramedic who went back to school and became a PA after he injured his back at work. Others have made suggestions in previous posts. EMS is in many ways a calling and a lifestyle, it's not just a job. This can really increase the sense of loss when you can't do it anymore. Hang in there - if you play you cards right, you can have a wonderful life. In spite of everything, I have been through I would not trade places with anyone.
I hope this helps!
Vince