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I just get grumpy with bad behaviour.

I wouldn't say I was grumpy. It's more pathological - I have seismic tantrums. I get red in the face and cry at least three times a week, and I have to lie down and have a nap afterwards.

I think I have a lot of internal energy, which does need to come out.

I'm using more energy than ever.

You can run out of energy if you take on a lot of stuff.

Put good energy out. Get good energy back.

I have an awful lot of energy.

I no longer have the energy to get really angry, like I used to.

When you can't do something truly useful, you tend to vent the pent up energy in something useless but available, like snappy dressing.

If you're feeling frumpy or grumpy, try to eat Paleo. It's a way of eating that is sometimes referred to as the 'Caveman Diet.'