My daughter is 13 years old and the other day at gymnastics, she came out out of breath, saying her heart was pounding and that her vision was going in and out. She said it was very hot in the gym. She settled down after awhile. It just happened again, without the heart pounding, but her stomach was hurting. What could this be? She has not started her period yet.
Hello, Regarding your concern, I would explain that her symptoms could be related to low blood pressure or a panic attack.  Coming to this point, I would recommend to closely monitor her blood pressure values and performing some blood lab tests (complete blood count for anemia, fasting glucose for hypoglycemia, thyroid hormone levels for thyroid gland dysfunction, blood electrolytes for electrolyte imbalance).  You should discuss with her doctor on the above tests.  Hope I have answered your query. Let me know if I can assist you further.