Over the past week when ever I have done intensive exercise I have experienced an intensive sudden headache that will stop me briefly from exercising and last at its peak for a matter of seconds. I feel fatigued after for some time. I am 16 and have exercised my entire life, this has never happened to me before.
Today when it happened this morning at swimming training I felt real fatigued well after for about an hour or so and my resting heart rate went from a normal 54 beats per minute to around a 100. My blood pressure was also significantly higher. It has slowly decreased from this peak over the day but still is significantly higher.
I have just come out of a bout of flu but am currently not experiencing any sever illness, just a slight cold.
Any information anyone can give would be greatly appreciated.