The benadryl will cause heart palpitations in children. This is documented. Focalin does not do this.
If he is still on the Benadryl I would call his MD and ask if he can come off of it. It may be hard to contact them today.
I am not a medical doctor but have extensive training from the Miami Dade County Medical Examiners Office.
Any child that is having chest pain whether it be from heat, medications, or other stress related factors will indeed feel the fear of dying and be afraid. This compounds the feeling.
Going back to the EKG saying that all was well I would discount at this time any immediate concern over the chest pain unless it becomes clear to you and more evident.
One topic I want to touch on ever so gently not knowing what camp or where he has been. You show your from Georgia.
And I am by no means saying this has occurred but something to consider. With all other communication mentioned above and using and going on that the anxiety has me a little concerned. Is there any possible way he may have been sexually abused in anyway at this camp that would indicate to you some of his sudden onset of problems? Some of the symptoms are indicative of this but not factual all the time. I know this is delicate by nature but it is a possibility that something may have occurred while at camp that has him agitated more then he should be. I hope you understand what I am trying to say and that I am saying it with the utmost of personal concern and thought. This is something that perhaps you or your husband may discuss later with him to rule out the chest pains and added anxiety above his normal range.
Other then that scenario I would go with the above info suggested of dropping the Benedryl upon the Md's approval or yours if you feel comfortable with doing it. I feel this is indeed adding more stress to his body.
Check him regularly and keep him calm and rested for the remainder of the day. If he is still feeling the same after being off the Benedryl and persist of chest pain and fear of dying then go ahead and get him to his primary asap.
It does seem though that he has had a rough week in very hot weather and compounded with meds has had a mild to slight reaction to the two.
If I can be of further assistance please do not hesitate to ask for me.
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