HI, Yes For Years I Have Lymph Nodes That Are

HI, Yes for years I have lymph nodes that are very painful as they fill posterior to right mastoid. A Ct shows short axes of 5mm with several nodes together..
But the doctors say there is nothing to worry about. The pain is intense so I just want to get rid of the pain. Does it mean I may have a problem with something else as I do on and off with my thyroid.
thanks