I have not found any reference that pulmonary fibrosis heals — generally worsens over time. Lung transplant is the only real “cure”.
When my Doctor diagnosed me with Idiopathic Pulmonary Fibrosis ,she sent me to a world class expert for a second opinion because she wanted to put me on an experimental drug, and the Insurance would balk.
One of he first things the expert said to me at 79 years of age was "Well your to old for a lung transplant , the only chance you have is trying one of the two new unproven drugs for IPF. Otherwise you will be gone in two years".
Six years later I am still hanging on.-Tom