Lymph nodes in front and behind ear, still swollen a week later. 12 weeks and 4 days.

So I read the lymph nodes mean you’re body is fighting someone off, only they have been there for an entire week now. Last week I felt horrible, I mean I was miserable with a headache, allergies were terrible, you name it. This week I’m ok I say, I sleep a lot but just wonder if I should go get checked out as they say the lymph nodes shouldn’t be there an entire two weeks.. 12 weeks and 4 days today.

Opinions?