Fatigue, swelling on tongue, face area.

For past couple of years I have lymph node swelling (5-10years) without any infection no fever or weightloss. Previous diagnosis said lymphadenopathy. However it is seriously affecting my daily life, I feel fatigue and swelling in face area lymph nodes especially, currently a pain in two three spots on tongue is bothering me. Whom should I show it to first ? A dentist, general physician or a cancer specialist ? I have family history of lymphoma in one of my parents. (Diagnosed and trmt over at 2 years) Feel like constant swelling and dull pain on tongue. Also at times shooting pain in parotid gland area near jaw muscles, which lasts a few minutes. Having depression symptoms too because of this. Kindly advise where to start ? Whom should I see first ?