Doubts

I start today by having doubts about the storyline that I am well over 50,000 words into. An author friend of mine once said to beware of a storyline where you love the subject matter so much that you can't see past it. I am wondering if that is where I'm at since I'm having such trouble putting it down on paper. I've sent it to friend for a reality check. I'll guess we'll find out soon enough!