My advice for back pain has always been hot then cold.
Use a heating pad for 15 minutes, wait 30 minutes then use ice pack for 15.
You can repeat this every 2 or 3 hours.
No it doesn't make it go away, but it usually makes it bearable.
As far as medical care, it MIGHT be a cheaper option for you to visit an Urgent Care if you have one nearby. You might want to call them and ask if they can treat back pain.
Best wishes to you.
Gale