The jaw hurts because the laryngoscope is held in by a clamp which keeps the jaw open and this is usually in place for about 45mins at least.
Take ibuprofen if the pain is that bad, but it will go within a week.
As far as the voice is concerned, the hoarseness is quite normal and may take up to 3 months to return to normal.
Some surgeons say, do not speak for a week but other surgeons say speak normally but don't shout or whisper. I favour the latter.
Good news about the biopsy.