The symptoms as mentioned in your post can be attributed to musculo-skeletal injury or spasm.
Symptomatic relief can be obtained by application of ice, analgesic
& muscle relaxant
gel, intake of analgesics like Diclofenac
(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.Physiotherapy
exercise will also be helpful.
If symptoms still persist, it will be better to consult an Orthopedician for proper clinical examination.
Till then, maintain adequate hydration & nutrition status, take proper rest and avoid stress.
Wishing a Good Health.