I have hp, with fibrosis, uip, COPD with emphysema... Etc. I'm on cellcept (mycophenolate mofetil) and prednisone but dyspnea gets worse, CT is better but pft is worse. Should I focus on antigen determination or what?

Continue treatment. At this time your best bet is to continue your current regimen. Once fibrosis is present, preventing new fibrosis is the main goal and your current treatment program is sufficient for that.
Check allergens. I recommend that you have allergen testing performed especially for inhalant allergens. I also recommend that you look into getting a high quality air cleaning system for rooms where you spend the most time. You should also be checked to be sure that you do not have exercise-induced asthma.