Hi ! It is good to know that you are a regular active player. The symptoms of yours are non specific and can occur due to very many reasons.
At the outset I would suggest to have a routine blood test
, urine test and a blood sugar test for you. Get your blood pressure monitored. If all these are normal,try to keep yourself well hydrated before you go to the court.
In case the symptoms persist, I would suggest you to see your family physician to decide if you have to go for more investigations.
Take care. Thanks.