@BUBBA_BDS:
Either growth spurt or the too much energy drinks.
Some people react badly to caffeine (a young friend of mine had a mild heart attack and was rushed to hospital after 2 cans of coke recently) - and energy drinks are obviously full of caffeine and loads of sugar too. Add to that the adrenelin rush of playing MW2 or whatever and you're asking for trouble.
Caffeine takes around 1hr to circulate thorugh every cell in the body - so if you have a can at 9pm, you'll be at full effect by around 10pm and it will last several hours depending on your tolerance. The sugar will kick in sooner and gives that almost instant alertness. So drinking these drinks before bed is pretty stupid (done it plenty of times myself) - your mind and nervous system are buzzing, but your body is exhausted and is not resting and able to repair itself. You end up drinking more the next day because your body is more and more fucked.
Try cutting out the caffiene completely and reducing sugar - you might get headaches for a few days while your body clears stuff out but you need to rule the caffeine out. Hopefully it's only that and not a heart problem.
To get more energy during the day, try eating a piece of fruit, or some watered down fresh OJ, and eat things with b vitamins (or take a b-vitamin supp to help release energy). Make sure you eat a decent breakfast and support your bodys energy needs throughout the day by eating several small meals.
Try getting more exercise - don't push yourself until you know where you are with the heart issue. Take a walk before you go to bed and make sure you've got nothing outstanding to do that'll be on your mind, read something, listen to music and relax.
Also, if you've got any other worries or problems, try sharing them with someone and getting them off you mind.
Hope all works out ok for you.