^ Bad news that one.
Honestly, and I understand from a chronic pain perspective and an ex IV addict (Meth, MDMA, lots of meth), They've cut you back on meds that were insufficient to begin with (Oh boy do I understand that, I supplemented my regime by purchasing 240mgs per day of illicit oxycodone, someone's script actually) and you're considering shooting your pills. Say you manage to hit every time perfectly....this is gonna be useful for maybe 8 weeks tops I reckon. Your tolerance is going to rise, very shortly you'll be getting 2 shots per month out of your script and unless you suicide the rest will have to be substituted with illicit drugs which will end up being Heroin if you're in the US due to it's prevalence and price as pills are eventually too expensive, certainly the amounts you're going to require. I understand wanting to live a "somewhat bearable life" but it will be bearable for a few weeks maybe a couple of months until it's completely unbearable and I doubt you'll give a fuck about your arms then.
Are you on any anti-depressants? Benzo's? anti-psychotics?