I'd like to state that i'm not a Dr.
I personally believe that almost any Indica strain would be helpful for you to feel less pain and CBD tinctures would be great. There are plenelty of options for you on the market to check our different brands & products (Hmbldt dose pens makes a called "relief" could be a great option for chronic pain)
A good article for you: http://herb.co/2015/09/20/marijuana-for-pain/
I hope this was helpful!