My son is having tightness in his chest and finding it hard to breathe. He has diaherreah and having problems creating saliva.  Any position he lays in is giving him the tightness in his chest.  Hes been up all night.  Took him to the ER this morning and had a chest xray and it was fine.  He also has no appetite.  This has been going on for two days.
Hi thanks for asking question. Chest x-ray normal, so pneumonia like condition mostly less likely. Here it could be simple generalized viral infection as you have diarrhea also. Treat it symptomatically. Take more water. For nasal blockage decongestant can be taken. Anxiety can lead such chest muscular spasm. Avoid anxiety and stress. Sometime gastric problem might lead such chest pain. Muscle relaxant Chat Doctor. ECG also done if chest pain refer to shoulder and arm also. You will mostly will OK in few days. Wish you good health