The federal government has been a problem. Some suggest pharma is holding it back as well. A bit of a chicken and and an egg problem. There are no studies that show any medicinal value but it can't be studied because it is classified the same as heroin. However some of the more progressive states have gone around the federal government and legalized it for medicinal purposes and recreational purposes and there are studies being done on it now.....as long as Sessions keeps his nose out of it. Not all pot is the same. There are strains that have low THC and various cannabinoids. The right combinations could give pain relief without the side effects that you describe.