Hi.A small swollen tender lymphnode doesnt lead to above said complaints.Because of sinus infection
,there may be headache ,but it will be relieved with medication.A single lymphnode enlargment can't be a Lymphoma
.In Lymphoma,multiple lymphnodes
will be enlarged,rubbery in consistancy.But,to say whether your lymph node is Cancerous or not,Get Fine needle aspiration cytology/Biopsy
done.Hope it is non cancerous.If you review with the report,i will further clarify.Take care.