I had a knot come up behind my left ear midway's up this morning, as the day has continued I have gradually gotten a headache which has chosen to have gotten worse through the day.....The knot is very ,very, sore and if you apply pressure it sends shooting pains....my ear did hurt this morning when I woke but, hasn't since.....should I seek medical attention tonight or might this be a sinus issue and can hold til morning?