Avoid paying for RSO unless it costs less than 5/g, its made from trash trim and iso/acetone (its cheap, nasty stuff as far as concentrates go). And definitely dont try to set up an oxy trade online, thats too risky, even if you need medication. If your location is accurate, there are a lot of dispensaries/coops in the seattle area that, if you ask for some trim to make RSO/hash/whatever, will take one look at that scar and give you a garbage bag full so you can make some hash. You may even be able to get some concentrates/hash for free.
Your best bet, if you dont want to go to random dispensaries begging (I understand the feeling), is craigslist. Tell the truth, and put up that same pic, and you will get a flood of donation offers, Im sure. If you were near me I'd give you some myself. Just avoid mentioning the oxy and esp any trade offer, or you will get flagged. But you'll be surprised how many responses you get to a legitimate request for medication on CL.
For that type of pain, if you have a choice, try something Sativah dominant or pure, and oral is your best bet for pain relief. Taking your herb and making limonene tincture or concentrating to oil/wax will help you dose precisely, and stretch your herb.