Asbestos exposure - chest pain

I was exposed to brown asbestos 8 years ago. Last year, all of a sudden I had chest & back pains, swollen neck, trouble swallowing, breathlessness. After a few weeks the symptoms all went, apart from a dull ache to the right side of my chest, which I've had ever since - that was 16 months ago. Last year I had all the tests carried out - x ray, ct, mri, pet & they all showed up negative. The specialists say they can find nothing wrong with my chest. I've since read about mesothelioma patients who had chest pains many years before they were diagnosed (upto 12 years), albeit I dont know what tests they had when they first got their pains. There is a reason why I have these pains and I can't think of any other reason other than asbestos, and the Doctors have given me no alternative reason. I don't know what else to do, as I don't feel I can just ignore pains I'm quite sure are due to asbestos exposure.