please help me swollen lymph nodes

for the past month i have had swollen lymph nodes in my neck. i went to the doctor and he sent me for blood work which came back showing i had a minor infection. so he put me on the antibiotics. the lymph nodes did seem to go down. but i didn't finish the antibiotic. they are still swollen. they dont seem to be as bad as they once were, but are still there. i have no symptoms of anything like night sweats, weight loss, extreme fatigue, anything that would make me think cancer. but, the lymph nodes dont hurt at all. i am really getting concerned. i am terrified that i have lymphoma. i went back and he felt them and said that they felt better to him. but why are they still there? before i went i had a tendecy to sit and feel them all day every day so i am scared they wont ever go away. if my blood work was ok then that means i dont have cancer right? and they had been swollen for 3 weeks at that point so would it show cancer then? please help me, im terrified