Have these symptoms for at least 6 months. Have had various blood work and bone marrow biopsy. The biopsy was negative and blood work up was okay but still have symptoms and no improvement. What do think could possibly be the problem? Symptoms: nauseous feeling, night sweats pain in lower abdomen, pain on left side radiating to lower back with pain intensifying on left side, little appetite, eat a little but feel full right away loss of weight, fatigue,