Wecome to the forum. Is your son in the hospital now, or at home? If the chest hardening is something that his Dr. doesn't know about, get him to his Dr. or the ER ASAP.

Its good that your son is a fighter and staying positive. Pain can be wearing. Let us know how things are going for him. And you. Others will probably post on this that have similar problems as your son. You will find support here from good people.

Sam