Now, Mastahcheese, I've seen a fair amount of troubled people in my day, and I can tell you right now that what you're having is called hypervigilance. It's an unpleasant condition primarily caused by, as you said, traumatic memories triggered by something that features in them, a tazer, in this case. You are constantly and irrationally on high alert because the pathway in your brain that's supposed the alertness off is not functioning properly. I never had this condition myself, but I know a guy who used to, and the good thing is that hypervigilance is perfectly treatable, both with counselling and with drugs, and any psychologist worth his salt can help you with that. So I'd advise you to go and see your GP as soon as possible.
Alleecat, the same goes to you. I have, several months ago, had a depression nadir so massive that I was literally unable to move, let alone do anything productive. But, again, a competent psychologist or counsellor will definitely help you with that, as I can say from experience, and I am sure he will help you explain to your parents what exactly you are going through. It may be tough to do the first time, but you need to get some help. It'll do wonders for you.
And Bay12 will always be with you, no matter who or where you are. I know neither your names nor faces, but if a guy or a girl comes up to me and says "I'm from Bay12 and I have nowhere to go", then, well, did you know that my dacha can house 24 people in separate rooms and has a fully-functional finnish bunker just in case things get really nasty?