What do you recommend for the pain of ankylosing spondylitis?

For arthritis in the spine, you should try cannabis topicals. I would start with Sweet ReLeaf's extra strength formula. Its a fantastic topcial, with a great smell that works very fast. Check them out here: https://www.hellomd.com/biz/sweet-releaf

Another brand to look out for is Om Eible's Lion Balm: https://www.hellomd.com/marijuana-undefined/lion-balm

You may find that different topicals work better for your own skin and particular concerns.

ryan