Having the problem of itching, weight loss and sweating for more than 2 months. but the lymph node biopsy shows normal result. what is the problem ?

Weight Loss & Sweats: Unexplained weight loss and sustained sweats - which might indicate a fever or hyper metabolic state should be taken seriously. Your doctor apparently ruled out a lymphoproliferative disorder by virtue of the biopsy, so now the hunt continues. Do you have a low grade fever? Is the itching "constant, " or only at certain times, say after eating? Your doctor should run further tests.