I had a similar-sounding issue two years ago, almost 100% bed bound for a month. The only thing that helped me was some stuff through an acupuncturist (a weird device that scratched at my skin and relaxed the muscles, then acupuncture, plus muscle relaxants and epsom salt baths between appts, etc). When I was physically able to, I took up yoga and swimming to strengthen the flabby muscles that caused the issue.
I needed an appt every two days or I'd have severe pain again.
I didn't get (or ask for) a deal, but my "free medical system" reimbursed me for 1/5th of each appt, and after a month I was good to go. I was out of pocket at least $500 for that aspect of the injury alone, but it was $500 well spent. Appts ranged $60-$120 each, IIRC.
So, I don't know how to get it cheaper, but I would encourage you to continue spending on the thing that works. As you correctly note, mobility is worth it.