I get this sensation ever so often expecially when I have to focus a lot (driving , work,etc) it feels like something is brushing against the back of my neck near the upper traps. The feeling is often followed my a "surge" of energy that runs through my spine and to my arms. I don't know what it is but it does annoy me sometimes.

you might want to see a docter

I would agree w/dakasha on this one - see a doctor first. Some things you might make note of:
Eating habbits
Drinking habbits: I do not mean just alcohol - but coffee, water, juice, pops, etc.

This has happened for years. Its not an everyday thing just ever so often It happens. My doctor said I was in good health and my diets fairly clean. So I have no clue what it could be. After its all over I feel more alert and my vision and hearing are better. I'm a freak thats it. Maybe be a chakra thing I don't know.

well i suspect a pinched nerve to tell you the truth. im not a docter but im pretty sure that this could be what it is.
a docter wouldnt be able to tell by normal examination i think

please look at (What i have labeled as a "Mind orgasm") in the Mysteries of Mind space and Time that topic discusses it well i even had comments i put in there

I've read it thanks. It's not the same thing. I'm not in a drunken stupor or so relaxed as to be deprived of oxygen. Its happens when I am very focused on doing something. Sort of like a build up of mental energy that just releases. Boom its gone then I get that lightbulb over the head sensation. My faculities are then heighted for a limited time mental, physical,and dare I say it spiritual. I know its not a pinched nerve I have one of those in my lower back from when I injured myself lifting weights. Pinched nerves just constantly nag. Those energy burst (for lack of a better word) have been happenening since I was around 7 years old. Just thinking about it I've heard that student who have been studing for hours at a time, get this. I can't remember what it's called though.