Thanks for posting on HCM,
From your description it is clear that you are having a chest infection; which will have to be ruled out first before we can start considering other possible causes of lung disorder.
Your description shows that you might be having bronchopneumonia
due to bacterial infection and that could be determined with Chest x-ray (your description is unspecific), blood tests (to look for signs of infection and possible causes). If my suspicion is right then you will have to be placed on antibiotics such as amoxicillin-clavulinic acid for about 10 days.
The possibility of lymphoma
is likely but that will have to be considered after several other tests are done to rule it out.
Hope this helps