Can a cavity in wisdom tooth cause jaw discomfort, ear pain and burning on the mucosa around tooth but NO TOOTH PAIN. Maxilla soreness inside mouth.

Yes. But so can infections around the tooth, TMJ dysfunction, and an ear infection. This can only be accurately diagnosed with a clinical and visual examination. Make an appt with your dentist and/or an ENT specialist.
Yes. this is likely secondary to nerve irritation. See your dentist asap. May take ibuprofen for pain. .
Yes. Yes. For best results with wisdom teeth, make sure you are evaluated and treated by a board certified oral & maxillofacial surgeon.