@beats32 -

I had this same experience at your age. Stay away from ENT.

Occipital muscle tightness, tight neck flexors, forward head posture, masseter tightness. Your trapezius/SCM muscles are probably tight and you don’t know it. This radiates into your jaw/ear/face and can feel like sinus pain.

See a PT and work on stress management/muscular tightness.

*I am not a doctor. But this area crosses over into many specialist areas. ENTs are often seen due to pain referrals here. Be careful.