On 2 Recent Occasions I Was Out In The Sun

on 2 recent occasions i was out in the sun and the air temp was about 80 degrees. once playing golf and the other washing my car. whenever i bent down and came back up i experienced some dizziness and anything white took on an exagerated brightness. no shortness of breath or pain of any kind. im 67 years old and exercise regularly. i do take blood pressure medications and it is under control.