I was diagnosed of lymphoma about 7 months ago. I already finished the chemotherapy and the cancer is in remission. My symptoms were different than yours. I started with stomach problems that were increasing little by little until I had an endoscopy. The doctor found a tumor in my stomach, which was generated by the T-Cells. The diagnostic was the T-Cell Lymphoma. One of the symptoms I had for several years was the night sweats, typical of the lymphoma according to my oncologist doctor. I never had any swollen lymph nodes I could notice or see.
Hope you find the right diagnosis and keep yourself strong during treatment.