Ouch! I'm sorry you are having to go through this. No fun for sure.
The popping thing and weakness in arms/pain in legs bothers me.
I hope you're alright! Your main concern now should probably be less your job and more the long-term affects of a back injury.
You're doing the right thing by seeing a doctor.
You have to look out for yourself because no one else will.
Your facility can't get rid of you just because you hurt your back there. That's illegal.
We have CNAs going on "light-duty" fairly often due to back injuries or other injuries suffered on the job. It's not that uncommon.
If you have to miss work for a few days then you have to miss work. They'll gripe but they'll survive. I don't think you will have any problems getting a job after this. Your personal health history is your personal health history. You don't have to say anything and if worker's comp ever comes up, you can always explain what happened. It's VERY common for someone in your field to have a back injury on the job. You're in good company.
Just follow what the Dr says and allow your body to heal itself.
Good nutrition and plenty of rest is a good start.
Please keep us updated on how you're doing and good luck.