Oddly enough... I just recently was referred to a new psychologist. Two of them actually.
Here is the kicker as it relates to your post. Both of them are specialists in "pain management" and they both operate out of the University Alcohol & Drug Rehab Clinic. They aren't trying to detox me but I'm sure if that became an issue, they would assist me with it.
I was referred to them for evaluation & treatment as part of my Vocational Rehab. Which is basically a state service operating as a branch of Workforce Services (the people who you go to to apply for unemployment or disability. They are set up to help people with disabilities find employment. I'm guessing that Substance Abuse and Alcoholism fall under the category of a debilitating illness, so they work with these therapists on a regular basis and so when they looked up pain management psychologists, they cross indexed with drug rehab specialists.
Anyways the gist of it is the state is paying for me to see them as part of my treatment to make me more employable. Which makes sense as pain and pain medications definitely have an impact on your overall affect, which includes (but is not limited to) pain related depression.
So my suggestion is to check with your state resources. They definitely want to find work for people with disabilities, even if its working from home over the phone 1-2 hours a day. With the current state of our Social Security system; too little money for all that people have paid in over the years, they are willing to pursue anything that provides outside income and conserves money for the future .