The symptoms like something is stuck in the throat, excessive dryness, frequent clearing of throat, voice changes, some heartburn etc are related to gastric reflux and the Treatment is to treat gastric reflux and these throat symptoms will resolve. The pain in ears could be due to many causes not present in ear like any dental infections, enlarged lymph nodes in the neck, salivary gland infection, tonsils infection, temporomandibular joint(jaw joint)etc. This is known as referred earache. The treatment however is to clear the primary problem and the earache will reduce. In your case due to prolonged mouth opening the joint must be strained therefore causing pain