Suggest Remedy For Vomiting With Diarrhea With Pain In Chest

My son is 5. He has been complaining about random pains in his body. We took him to urgent care yesterday morning, when a fever showed up, and his Dr. had no openings. They found an ear infection. He was started on Amox. Then last night he began vomiting and diarrhea. About 5 minutes ago he started complaining that the pain in his arm was back. (it has been here off and on for over a week, but half the time I don t know if he is pretending). However, following his cry about his arm, he grabbed his chest, started screaming that his heart hurt and for me to do something. I called the Dr. and left a message. So my question (finally) is, could this be a heart attack? Should I take him to ER or am I ok waiting for the Dr. to call back? Oh, the pain is in his left arm. the other random pains have included his right leg and his head.