Oh, 8hours, it's so hard, isn't it? I certainly felt like you on more than one occasion. What made it particularly bad was that the puppy was completely my idea, I had worked so hard to convince my DH that it would be fine, and I had been very stubborn about the breed as well. I really felt like I had ruined a perfectly lovely life by bringing a small furry demon into it. Like you, I had less time for the kids and they were getting nothing out of it at all.
All I can say is hang in there. It will get better!! I don't know much about border terriers, but I am sure they wouldn't be as popular as they are if they never grew out of the horrible stage! So, just give it time. I found that things really improved once we could start taking her out - especially when she got to play with other dogs. Do you have any friends who could bring their dogs over, or go to their houses until your puppy is fully vaccinated? The stimulation of a canine friend to play with seems to wear them out as much as any amount of walking, in my (admittedy very limited) experience.
I really do sympathise. My puppy is incredibly pretty - think slightly fluffier, whiter Andrex puppy - and she would have people literally coming out of their houses and crossing roads just to stroke her and tell me how gorgeous she is. Meanwhile, I would just stand there nodding with a slightly forced smile, thinking "yes, she is cute, but you have no idea! she is actually a hideous crocodile who hates me and tries to kill me on a regular basis". I never said anything though! Luckily, things are so much better now, they really are. A the moment, I don't think I would ever have a puppy again though - but just like with babies, I will probably forget the extent of the horror!
DoubleMocha, I am really looking forward to hearing all about your Viszlas when he comes home! Viszlas were on my shortlist - they are gorgeous!
Fanofthe, my puppy is very barky too. I am trying to ignore her but it is hard because it's such a piercing sound!!