Your investigations done for the chest pain was reassuring. That ruled out heart problem. Your can still have an atypical chest pain called prinzmetal angina
, which is basically spasm of your coronary arteries.
But more worrying is sweating excessively at night and weight loss
. This can be due to infection like tuberculosis
outside the lung and in few occasion due to disease of the lympnodes (lymphomas).
I am not sure where you live, but you need to have certain blood test
like ESR, CBC, Liver profile, LDH, Beta 2 microglobulin. CT of the chest abdomen and pelvis. If there is any enlarged lymph node
larger than 2 cm in size, you need a proper tru cut biopsy and NOT a needle aspirate which most often give false negative pictures. Get it checked out soon. Hope it is nothing serious. Best wishes.