I had double pneumonia last year. Three different specialist could not find the cause and finally a cardiologist diagnosed it after a heart CT. Had pneumonia again in April this year and again, all tests and x-ray negative, but classic pneumonia symptoms are there. It's now a month later and already finished a course of levofloxacin (allergic to penicillin) took last 1000mg on Saturday and it's 24h later and have yo use nebulizer again. Any ideas on which path to go doen next? All tests always come back negative and some doctors already blaming g it on mental illness (despite coughing up balls of muc and persistent fever of 38 Celsius.