Beyond the obvious agony that is. He will be recovering from severe extreme dehydration, heat stroke, burns, hunger, weapon injuries, ick a parasite infection and partial blindness to start with; I may get meaner to him. We have a late teen/early adult guy in excellent physical health who was out on his first holy mission; no it did not go well for him, there are just some things you can not prepare for. He will wind up with spiritual and emotional damage as well. So hallucinations? different pain types? Sensory info?
So all those with 1st hand accounts of what sensations you experience and what the mind is like, particularly the weird uncommon stuff, after traumatic injury chime in. Assume limited drug options.