Hello dear,
The symptoms as mentioned in your post can be attributed to musculo-skeletal injury.
The swelling is due to the impact as well as accumulation of fluid and blood after the fall.
X ray of the chest and spine can be done to rule out any pathological cause for the symptoms.
Symptomatic relief can be obtained by application of ice,
analgesic &
muscle relaxant gel, intake of analgesics like Diclofenac/
Ibuprofen (to be taken after food) +
Pantoprazole (to be taken 30 minutes before meals).
Supplements of Calcium & Vitamin D can be included in his diet which will help in strengthening of bones.
So, kindly consult your Doctor/ Orthopaedician for proper clinical evaluation and management.
There is no need to worry, he will be fine.
Till then, he should maintain adequate hydration & nutrition status, take proper rest and avoid
stress.
Wishing him a Good Health.
Take care.