Hello, I'm sorry to hear about your situation and your difficulties in trying to find out what is wrong. Maybe I can offer some help. Last fall during my senior year of college, I started exhibiting strange symptoms..night sweats, pallor, some weight loss, problems with my lymph nodes and jaundice. I had also noticed some changes in my appetite. I finally went to a General Internist who ran many tests. Fortunately, he was a very compassionate doctor and took the time to rule everything out. It turns out that my blood tests revealed an unsual type of anemia--deficient in folic acid. He wasn't sure what was causing the anemia and sent me to see a hematologist/oncologist. I was also scared of something like lymphoma or leukemia--but luckily after many more blood tests, it turned out I had a rare blood disorder called hereditary spherocytosis. It turns out that this condition causes a rare type of hemolytic anemia where red blood cells are destroyed faster than they are made. Luckily, I've gotten the proper treatment and know how to manage the condition, although I'm still fatigued a lot.
If you're concerned about lymphoma, I would recommend seing a hematologist/oncologist..usually after a few diagnostic tests they can determine what condition you have. This may include a bone marrow tap, complete blood workup, blood smears, CT scans, lymph node biopsy or a test where you swallow fluid and they exam your lymph system with an xray. It's definitely not the best situation to go through, but once you find the right specialist..you're on the right track. I hope you are able to find the proper medical treatment that you need, and don't give up! Sometimes you have to keep pursuing until you find the right answers. Good luck and all the best in the new year