Suggest Treatment For Clogged Ears And Nausea Along With Dizziness

My ears got plugged ( as when you swim) when I was doing a strength training session... i got thirsty more than usual, I was yawining (very strange) i also felt light headed, a bit nauseaus and finally SOB during the final 4 min. HIIT exercise which I only completed half of ... i switched to low intensity elyptical, and my left calf started to cramp all the way to the foot. I stretched it a bit and continued the low motion to cool down. The exercises varied from weight pulling, floor abs, push up to body weight exercises.... what do I need to look at, was it dehydration, low potasium? what kind of imbalnce was this?