How to get Disney to approve treatment for a lifetime medical workers’ comp injury?

I worked for Disney for 30 years. I worked in a kitchen and we had to carry and lift very heavy things. I injured my wrists, shoulders, and entire spine. I had a workers’ comp claim and received lifetime medical. I am in severe pain all the time. I have crushed discs that are pressing on nerves. I am honestly in severe pain 24 hours a day. I have been given narcotics and they do not relieve the pain. The problem is, Disney continues to deny treatment that I clearly need. The WC case was settled in 2007. I continued to work until I could no longer tolerate the pain. It seems as if Disney had s intentionally making it difficult for me to get treatment. I have an attorney but there’s no money in it for her so it seems like she’s not so concerned with my treatment. I do not know what to do. What I have given you is just the tip of the iceberg. I have all the documentation. Do I hire another attorney and start over? Can I sue Disney for denying treatment?