How can I get a breast reduction? Is there any chance some or all of the cost will be covered?

I have arthritis, hypermobility and fibromyalgia. I’m also 5’1 with size G breasts. I believe a breast reduction will help with the pain. I want to move forward with it but I don’t know the steps to take and I don’t know if my (BC Government Disability) insurance will cover the cost- or at least some of it. In short: How do I move forward with possibly getting a breast reduction?