If your son has Rhabdomyolysis
due to Crush, Blood supply, Exertion, Body temperature then he can take some temporary treatment but if it is due to Genetic disorder (which was recently diagnosed with Pompe disease) you should keep continuous monitoring and time to time tests on him because it may effect Liver
, Heart and Nervous system and skeletal muscles.Sharp pain
under chest, cough with difficulty in breathing and fever is suggestive of Pneumonia
. Try to use some steam inhalation for relief and antibiotics (after consulting your physician).
All the Best, Thanks.