Exercise
Yes this is totally normal. Even though I exercise everyday I sometimes get impatient with my progress and think I should be doing better by now and push myself a little too far. The last time I did this I made myself physically sick...I jogged longer than I should have. I'm lucky I didn't injure myself. That is what you need to be careful of...you don't want to push yourself to the point where you are injured.
I always say listen to your body you can feel if your pushing too far. I also suggest getting a heart rate monitor. It's a good way of knowing how hard you are working. You just figure out your target heart rate zone (you can google it and get instructions on how to do this) as long as you stay within your zone you should be fine.
Have fun with your workout.
Tom
“Nothing I will ever eat will give me the feeling I get as when I lose weight” The views expressed are based on my own experiences - and should NOT BE FOLLOWED IN LIEU OF DOCTOR’S ADVICE/INSTRUCTIONS. Only your Doctor knows your condition, and make sure you talk to them before making any changes to your diet