Hi,I'm a nurse,I work in respiratory medicine,primary lung ancer is very unusual in non-smokers of your age.Agree with Drac that pericarditis is a likely suspect,but so is lymphoma,which is much more treatable than a lung primary.It is easy to say,but don't panic,wait for the CT,it may not be as bad as you fear.Good luck and all the best wishes,but please wait for the scan result.
Ian