PLEASE HELP - About to give up...

Flicking your dog with your finger won't work.

First, it doesn't tell your dog what *to* do. It's also needlessly confrontational--puppies explore with their mouths, this is normal puppy behavior. And some dogs might interpret this as an escalation or a game, so it might make it worse.

Better to do what dogs do with one another: yelp loudly when teeth meet skin and remove yourself from play. Pup learns that biting stops play, and what puppy wants that?

Try that dog whisperer method like "Adogwhisperer" suggested.  Go to google and type in "dog whisperer".  His name is Cesar Milan and he has a show on the National Geographic channel.  I used his method on my crazy buy shy sheltie and boy-oh-boy what a difference.  Give it a try.  It might help you too.  Good luck...Diane

Puppy mouthing/biting should NOT be discouraged, This is how they learn to use their mouths GENTLY.   Here is how to teach them to play with their mouths NICELY.   [linkhttp://www.shirleychong.com/keepers/archives/bite.txt]http://www.shirleychong.com/keepers/archives/bite.txt[/link]

My puppy is now 2.  I found out the hard way that exercising him to the point of unconsicousness helped me enormously.  The more tired he was, the less mouthy bite marks on me.
 
He did so well in class and he is signed up for an intermediate class and we are having a ball.  Hang in there and exercise him.  Find fun things to do with him and before you know it, he will be 2 and a great dog.

When we got our Maltese at 12 weeks, he was so wild that we almost gave him up!  We could barely have him around us because all he wanted to do was bite.  But his biting was not out of aggression.  What about your dog?  Is he biting out of aggression or just trying to play?  Even play biting can hurt, though.  In training class, he barked non-stop at the dogs and was a huge disruption.  The trainer worked with him outside class to help stop the constant barking at dogs, but even she was unable to find a solution.  To this day, he STILL barks at dogs, but he certainly doesn't spend the majority of his time biting us or anything else for that matter.  One day when I was at  the groomer's, I picked up a little puppy that the groomer was selling, and the first thing he did was start chewing or "biting" on my chin.  Puppies do that.  That is normal.
 
Our dog used to jump on everyone he came in contact with.  You have to train them to greet others without jumping.
 
I hate to say it, but your puppy sounds pretty normal.  You need to give it more time.  But if you are not willing to be patient and train your puppy, you may be better off with an adult dog.

It seems to me that you are a "high intensity person" coupled with a "high intensity puppy", which should be a good match, eventually. (the key word being Eventually
I'd say that you need puppy friends for your boy, so they can tire each other out. Also, that you need to interact with him in a calm manner. Take deep breaths. Speak calmly. Move slowely. Stop interaction at every biting attempt. Approach when pup calmes down. Cuddle him when he is ready to fall asleep.
Be confident that he will calm down. You can do it. I feel for you