gnu, fwiw maybe keep in mind that no medication, no matter how well researched or how widely used, does what it's prescribed for 100% of the time or in 100% of users. A lot of percentages are (IMO) foolishly low - 20% or 30% of patients benefit, or fewer - yet these drugs get approved and become widely used on a "give it a try" basis. So I figure, if you can get pot one way or another, why not just try it? Medications' intended effects & side effects also do vary depending whether ingested, injected or inhaled or contact-absorbed thru' skin or rectum, so maybe also try both eating and smoking. Heck, I guess one could even make a tea and try an enema if one wished to.
Point being: I love that you are going for peer reviewed research as your primary source of information. Far more useful than click-bait masquerading as information. Yet statistical likelihoods don't affect your pain level, so all that info is not as important as whether or not the substance helps YOU plus your choice whether or not you're willing to live with its trade-offs.
I know chronic pain all too well and hope you find a way to mitigate it that suits you.