As someone who has just arrived at 14 week mark I can tell you it gets better really soon! As everyone has said it is completely natural to cry and pull your hair out in those first weeks, just make sure you have a bottle of wine and ice cream available at all times
Maggie was terrible with biting, but we preserved! The things that worked the best for us was when playing when she bites just freeze or stand up until she stops then continue playing then if she is completely manic cocker have a small (preferably empty) room or hall you can shut her in just for 1 minute to calm down. The crate was a life saver as well. Sometimes she would just be exhausted and get very mouthy but would just refuse to go to sleep so we just put her in there with a kong and she would pass out.
With positive training methods it is hard to see that it is working, especially with the biting, but honestly perservere and be consistent, it takes longer to sink in than punishment techniques but results in a much deeper understanding for the dog and prevents any other problems occurring.
My OH really struggled not to get angry with her when she did something wrong or ran off with his work shoes (
) but I told him to take a pillow go into another room and tell it off!
sounds silly but he said it works just to get the frustrations out!
It also gets so much easier when you can take her out for walks! Good luck and let us know how it goes.