Welcome to HCM
We understand your concerns
First you have to ensure that this incident has happened only once or not. If it is recurring, further tests and investigations might be required. If it is for the first time, with the tests you did, you might ignore it. Because child of 14 years do feel a bit nervous when something essential body mechanism happen, like excess sweating, palpitation
etc,. Such happening creates anxiety
and this anxiety might trigger dizziness
etc for a short period.