Horrible Catch below left ear, near jaw.

Hello doc **Urgent** I have a horrible catch below the left ear and near the left jaw. I am not able to open my jaw while having food as feel some terrible catch in the nerves or muscles or maybe the jawbone not able to identify but all of a sudden I have this catch. I had this a month ago too when a sudden a catch happened due to opening mouth wide while having food, but this time I did nothing of that sort... Because if this sprain or catch the pain has spread to me left ear...throat and severe headache on left side...with eyepain..I have a "pain lump" also below left ear and jaw section. Pls tell me how to overcome this catch... I tried doing small jaw exercises ..opening and closing mouth in small heights..but  feel pain while opening mouth. Can't identify if it is nerve or muscle or some flexible bone gone twisted? Kept warm bag on the ear jaw throat area too. What should I do? Any pills for this sprain or twist?