I suspect that the chest pressure is unrelated to the Advair™ Diskus® (fluticasone propionate and salmeterol) Inhalation Powder, especially when problem continued, after it was discontinued. And, Advair™ Diskus® (fluticasone propionate and salmeterol) Inhalation Powder does not make the lungs get hard.
There are many causes of chest pressure and not all pressure feels the same. The sensation can come from lungs, heart or the structures of the chest wall, such as muscles, tendons, ligaments and the nerves that run between the ribs. You should consult with a lung specialist to try to sort out the cause and then, with the correct diagnosis, treat it appropriately.