I have pulmonary hypertension, COPD and RA. My RA doc put me on a DMARD a month or so ago, I was on it for about three weeks and found I was having quite a bit of trouble breathing. I am on O2 at night, and when exercising but am pretty ok during the day. He said to come off of it for a couple weeks and then go back on it, and I dd that, but the breathing never got better. Could my COPD progress that quickly?