Hi iownazoo,

First of all. I'm sorry about your puppies behavior, sadly, it is normal. At this stage in the puppies life you must take control. My trainers tought me to "play" with my puppies mouth. Open it several times daily, put my hands in it, rub the gums, inspect the teeth, brush the teeth, and touch the tongue. Your puppy needs to trust you, especially in an emergency situation. Also during feeding, take the puppies food bowl away, just for a minute, then give it back. You need to be able to take anything out of the dogs mouth at any time. These things will help the puppy trust you, and feel comfortable with you hand around it's mouth.
Next, during aggression, sooth the puppy by soft petting, and using a soft voice. Aviod playing aggressive "tug" with the puppy
sometimes it creates a "mean" streak.
Make sure your puppy gets a lot of hard chew toys. Soft toys don't help teathing pain like the hard ones do. A soft toy mimicks the softness of the couch, and the dog will chew on everything.
If the dog bites you, immediately take him away from the situation, give him a sterm NO, and then soft petting with a soft voice will calm him down.
I have always used these methods, and if you use them, I hope they help.
Good luck, and oh yeah, get him fixed ASAP.
Catchall