My son just had a choking incident. He was coughing, so I know there was air flow, but he wanted me to do the Heinlich to try and remove the food particle. He spit up tons of mucus and food bits. He says it is better now, although he thinks he can feel something in his throat, and he is very tired. He is no longer coughing and seems to be breathing normally. Do we need to follow up with a doctor to be on the safe side?