Is it Mesothelioma Cancer? I have shortness of breath and chest pain?

I am afraid I may have Mesothelioma Cancer, I suffer from shortness of breath and have chest pain. I worked in a factory which used lots of different types of materials. I think asbestos may have been one of them. I don’t know what mesothelioma treatment options are available nor what my resources are. I already received a letter from a specialized mesothelioma law firm saying that I may be affected and want to meet with me. What should I do next?

Age: 54
Male
Medications: No