As per your description of the chest pain, it appears to be musculoskeletal in origin, and NOT a cardiac pain (Pain on movement or deep breath). I would recommend complete rest for a day. A pain medication can be taken if there is sever pain. Incase of persistent pain, dizziness, syncope , sweating or palpitation you may need to take him to the hospital. Otherwise no medical helps is needed now.
However I would advise caution. Please make sure that is not over exerting or under stress. Re start the routine activities at home at a much slower pace.