Chronic pain is exhausting, both physically and mentally. It's important that you be able to share with people who know what you are going through on a daily basis. Are there any support groups in your area for people dealing with chronic pain? They wouldn't have to be AS specific.
There are also some good support groups on FB. Two that I know of are "Ankylosing Spondylitis For Women" and "Standing Strong Together Against Ankylosing Spondylitis". These two are tightly moderated and haters are quickly booted. The second one was started by Cookie Hopper, a wonderful AS advocate.
You might also consider seeing a counselor or therapist. They can teach you techniques to help you deal with the pain.
I'm sorry you are having so much pain.