It's One of Those Writing Questions...

It's just one of those things...

I'm finishing off a novella (almost a novel) but it's not going well. I've found a plot hole in chapter 1, a hiccup to the flow in chapter 4. To be honest, I'm not sure the alternate 1st person POV works (albeit I've kept it to separate chapters). It's all about the guys and the romance, but the plot still has to be plausible and it just doesn't seem...
It's just not...
There's this bit where it...
I can't seem to get it...

Well, as you can see. I'm losing the whole grasp of it. 35k words and I can't get myself satisfactorily to the end. *ULP*

What the hell should I do?
Have you had the same situation?
How can I face chucking out all that work? But on the other hand, how can I NOT, if I just hate the f8g thing by now?

My options are to battle on and try to edit it (viciously, by now) into better shape. Or abandon it as insufficient potential, after all. I think if I move away from it now, I'll never come back. Is that the price I should be prepared to pay?

Essentially, how do I know if it's not working for me because (i) it's basically crap, or (ii) I just can't see it objectively any more?

*big self-indulgent sigh*