Swollen Lymph Node Under Jaw By Tonsil

I have had this lymph node swell up on me and give me alot of pain and pressure to the right side of my head since december 2005 ive had it 15 times already the doctors cant find a cause for it. Ive had an ebv test and it just showed old infection not new I had mono before I am in remission from medullablastoma since 1994 my concern is why do I keep getting this what is the cause no one seems to have any answers,and to have the same symptoms from beggining to end each and everytime 15 times in a row it has to be something Im desprate to know what this is! my symptoms are as follows first I start with headaches then with a general feeling of being sick like the flu then I feel the lymph node swollen and painful, pain in my,jaw,middle ear (no infection),and a pressure headache on the right side of my head,tired and I ache and I have low grade fever (99.9-100.3) and chills. Ive had this 15 times since dec 2005 Im desperate please someone help!!!! 

Something is going on .... I have had symptoms like this for years .... always know that my body is under seige and that I have to rest (dignosed ultimately with NHL).  Compromised immune system.  You need to get yourself to oncologist and keep on demanding tests until you get an aswer.  ?bone marrow biopsy among other things .... You are the sufferer.  Noone else will advocate for you.  You must pursue this until you know what is going on.