Dear Sir/ Ma'am,
Sorry to hear about your problem. This persistent lymphadenopathy
could either be due to an inflammatory condition like tuberculosis
or due to lymphoma
or cancer. This can be ruled out by a needle test (FNAC), which I guess has already been done. A PET CT
can also be done and that can confirm the presence of a cancer or an inflammatory condition.
Cancer can present with normal blood work as well and the needle test would be able to differentiate an inflammatory condition from cancer.