What Causes Chest Pain Only During Breathing?

I have been seeing a haematologist for 8 months now and have had 2 CT scans, 3 months apart and show lots of nodes around 9mm. Yesterday I went to the ER and with extreme chest pain when breathing but no pain when moving. The pain is worse when I lie down, the consultant I saw yesterday said it was costocondritis, the pain is not worse on moving just on breathing and also when I lie down and only on the left side. I am awaiting a lymph node biopsy, could this be Pericarditis and could it be related to either TB, Sarcoidosis or a Lymphoma. They gave me 3 different types of painkillers and told me they could not do anything more for me at this time and to wait for the biopsy result as this will answer everything. I have lost 2.5 stone in 6 months and sweat every night, I also have very itch calves at night and suffer from chronic fatigue and nausea. What is this most likely to be?.