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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.
As soon as you begin breathing again, the rate will come down, as the blood gets oxygen from the lungs and becomes normal again. When you hold your breath, heart rate doesn't increase. Rather, you can feel it prominently. Just hold your breath and check your pulse. Pulse will be normal (no heart rate increase) but you will feel your heart pumping in your chest.