Water took my breath away ?

Okay it was like 95 degrees yesterday . My fiance and I and some friend went to st Paul for the day. I did none of the activities such as cliff diving and zip line. All I did was sit in the water for a whole 5 minutes. When I got in the water though it was like I couldn't breath . Like the air just wasn't coming It was such a weird feeling I just wanted out of the water. Didn't swim the rest of the day . Just curious if anyone knows what could've happened ? I have never experienced something like that before