Our expert says:
It sounds like you're just training too hard. If that happens, then your body can't adapt and you never get the positive effects like improved fitness and endorphins. You've crossed over the line of being able to handle the training.
Therefore, it's important to draw back slightly. Not on the amount you're doing, but the intensity. If you're exhausted the day after training, then it's because you've trained too hard the day before. The grumpiness suggests the same thing. So I'd say train three days a week, but substantially easier than you currently are, and just relax about it. If you push too hard, your body will resist.
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