A helpful tip for anyone about to take their kid to hospital or to the doctor.
Take some video of the symptoms at home first if possible.
Most people have a phone with the ability to take video now. It's quite common to take your child all the way to see a doctor only to have the symptoms disappear 5 min before you get to see them in the waiting room.
If they're symptoms you can record, it makes it quicker to diagnose and more likely the doctor will get an accurate picture of the situation.