Do you live in a medical MJ state? If so, give it a shot. In fact, give it a shot anyway. Try this:
Mason Jar with lid
MJ leaf or flower with LOTS of trichomes
vegetable grade glycerine
I make a non-alcohol based tincture by first having enough juicy trichomed filled trim (and buds) to fill the size of canning jar you have. First take your dry trim and crush it up then soak it in cold water for 15-20 minutes ( this is done to rinse out the chlorophyll), then drain well.
Put enough trim in your jar to fill it to about 3/4's full. Add vegetable grade glycerin to within a few inches of the top. Cap and store in cool dark place, taking out at least once daily and roll and shake for 5-10 minutes. This process should be done at least 60 days, and can be left even longer for stronger tincture.
Empty everything into a pot and cook on very low for 10-15 minutes to help separate more of the trichomes, (never getting over 175 degree's). Then strain and or press to separate trim from glycerin. Some use coffee filters to for final straining. A piece of silkscreen works great too.
It sounds like your back is really messed up, and for that I'm so sorry and empathize with you. This tincture above won't cure it, and it won't relieve all of your pain, but it certainly will help a LOT.
That oxy is going to kill you. I mean that.