I'm sorry to hear you have pain. Sadly, it's not that uncommon for people with COPD to suffer from various forms of pain. You may have heard others talk about their rib pain or pain when taking a breath. Back pain is another one.
I thought you'd find this article that Leon Lebowitz wrote really helpful in dealing with pain. https://copd.net/clinical/tips-managing-pain
What have been some of your strategies for coping with it?