Happymm I am so disappointed to hear that your pup is still getting you down. It might not be much help but there were many dogs older than yours at puppy training who were still jumping and biting so its not just you! I got jumped up at and scratched on the arm by someone elses pup!
Been a bit busy to sit and update our progress but things are going OK. I still feel a bit confinded to our living/kitchen area as we don't want pup having full run of house and having to catch dog, put in utility room each time I need to put something back/go to loo/chage a nappy ettc gets a bit boring!
I have noticed that she has moments when the biting starts its almost like she is having a tantrum at not being played with or if I start to try and play with my DS - I try to forsee this happening but its hardwork! I also must try to timetable in some time to actually play with my DS and his toys as we tend to hang out in garden etc with pup rather than sit and play so I hope he doesnt feel too neglected
as it has been a lot of pup,pup,pup focus.
Puppy trainign classes are going well apart from tonight when pup was wired and not really behaving! I bought some new fish4dog treats and she loves them so kept jumping up for them where as i think the dry kibble-y type ones are good enough but dont' make her feel desparte for them.
It was heel work class tonight.........mmmmmm.......this looks like its going to be harder than sit
especially as we've been doing everything worng so far 
Stressed You are having a hard time! Keep focussed on the end goal of a well behaved dog!! We will all get there, but when youve cleared the 3rd lot of wee up in a day its hard not to open the front door and say "run quick!"
I decided to keep our dog on Burns as her poops got more solid, but a massive garden centre near us sells every type of dog food including the one that Kingsroadie recommended so I have somewhere to nip to if I decide to change and need a small pack to try. Plus its open on a sunday so any emergency dog food that needs to be bought can be got at!
Hope tonight and tomorrow goes well for you all