Dude, that is like a smoker saying, "Oh, I thought coughing was the only concern with smoking cigs".
You are making your body work harder if you are sending it into a desert everyday AFTER you trained it into the ground. That would be WHY you feel like crap.
That is why a biology text book would do most better than the latest personal training manual.
Let me train my chest until I can't scratch my own nose and THEN walk into the Sahara....for fun.