((((Tree

)))) I am so sorry you had this happen today. When the drug wears off you will be able to see if it is the drug. It sounds like your heart is not racing now and you feel better. Dont take the drug anymore! It is SO scary to have a reaction to a drug.
Can you call the doc to get another drug? Have a conversation with him about possible side effects? And any interactions with Klonopin.
I hope you had a fun day and your son had loads of fun!