Hi.I have rheumatoid arthritis, atrial fib and I am taking methotrexate injections one a week, hydroxychloroquine, synthroid, metoprolol, propafenone, warfarin and have a pacemaker. My concern is that synthroid has been found to cause lung cancer and metoprolol can cause lung inflamation and lowers my immune system. Should I change over to dissicated thyroid to improve my chances on lung problems? Do you have any other suggestions on my health problems? I am 74 years old- female and want to stay as healthy as possible. Thank you so much for your time.