I know this sounds easier than it is....but try to relax. I went throught EXACTLY what you are going through a few months ago, and I know how scared you are! I went in for my annual check-up in March, had a routine chest x-ray done, and the nurse called and said there were some "cloudy" areas that needed a closer look. Well, I had a cat scan, and it showed two small nodules in my lungs. Too small to be concerned about, and I have to have the scan repeated in 6 months to keep an eye on things. I have since learned that RA can cause nodules all over our bodies, lungs included. I'm a bit older than you, and I was a smoker for many years, so this absolutely put me into nervous fits, but the doctors have assured me that there is nothing to worry about....so I'm trying really hard not to.
Hang in there, and let us now how you do, you'll be in my prayers!
P.S. Just wanted to add something.....since you've had bronchitis for a bit, it's entirely possible that the areas they are seeing could have something to do with that, perhaps some scar tissue, etc.... try not to worry..Hugs!