Went to the gym today and I was extremely close to fainting. Only burnt around 230 calories.

I feel like shit. 

I was on the treadmill, got to two hundred, continued going, around 220, starting shaking and shivering, 230 and i was on the floor. I didn't faint, I was conscious. But I couldn't get up for around an hour after, a bit weirded out to be honest.