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Holding your breath is bad. The main reason is your body needs oxygen to workout properly. As you hold your breath you build up your CO2 in your body which will cause you to fatigue faster. Some of my clients either like to count their reps which helps them breath or during your contraction of the muscle breath out and when you relax breath in. So breathing will help you last longer in your workouts.
2) When you are holding your breath you can feel that you need to breathe. The sensation you are feeling is not the lack of oxygen, it's the build up of CO2. By holding your breath you are keeping the CO2 in your blood stream and lungs-this makes you feel desperate for air.