I had similar circumstances with a lymph node in my groin a few weeks ago. My bloodwork was fine, chest X-Rays were fine. I was fatigued, and still am, had a bit of night sweats, like you do. My doctor said that lymph nodes that are enlarged are normally the result of a virus or an infection. I was prescribed antibiotics, which didn't work. To make sure it wasn't lymphoma, he referred me to a surgeon, who surgically biopsied the lymph node. It turned out to be a reactive lymph node, which basically means that it's enlarged, and that it's nothing. Enlarged lymph nodes are normally not cancer, but since there is a chance of lymphoma, to be cautious, a biopsy is often recommended. Hope this helps.