Hi Cam. We're praying for your quick recovery. I haven't experienced pleurisy in connection with CF, but I had it myself around your age. It's a painful inflammation of the membrane surrounding the lungs. It can cause sharp pains when breathing. I believe it's usually caused by viral or bacterial infections. I was treated with antibiotics and painkillers, even aspirin or ibuprofen helped with the pain. It can be caused by fluid built up between the lungs and chest wall.....that's what I had along with a bacterial infection. It ultimately resolved when the infection was under control. Ask your doc to explain what they think is causing your pleurisy. Hang in there. I know it's painful. Be patient.
Blessings
Blessings