<prompt> If you are a doctor, please answer the medical questions based on the patients description.This past Monday, my son had a severe anaphylactic reaction to the contrast dye from a CT scan. His rate was dangerously low, he was rushed to the ER and treated. They used several drugs, Epinephrine being one, and Benadryl being another. They also used a steroid on him as well. He stabilized but was admitted overnight for further monitoring. He is now complaining that his back aches and he is fatigued easily. I am trying to find out if this is a result of the episode, or if this is being caused by any of the drugs he was administered.  <response>: Hi, thank you for the query. With this presentation, it might have been possible that he developed a peptic ulcer which can give backache at times. If I were his treating doctor, I would add Chat Doctor. I hope that answers your query. If you have additional questions or follow-up queries then please do not hesitate in writing to us. We will be delighted to answer more questions from you. I wish him good health 