Thanks for query,
You might have got following,
There may be lax ligament of temporo mandibular joint rsulting slight loosening of the joint causing clicking sound while movement at the joint.
For that you do not worry,avoid chewing hard stuff,do not open mouth wide open,keep your finger on the jt while yawning.
Another problem you have got that you might have acute frontal sinusitis
Go for X-ray maxillary and frontal sinuses
ok and bye.