I'm training for the Portland Marathong (Oct 4th), my first, and I was in this spot a few weeks back, although unlike you I quit on my long run that day.
I think I read a few things in your post that might be changed
1) Everything I read about a marathon says plan your race and race your plan. If you're following Jeff Galloway - then follow his plan. Walk when you're supposed to - it does no good to wait unti you feel like you "need" to walk, then it's too late.
2) I had a problem with running slower. I had the same "get it done, knock it out" mentality about the runs. I finally found a free marathon training run (which I'm about to head out to this AM as a matter of fact). The week after I failed at 14 miles on my own, I was able to do 16 (it was a challenge) and then a 21 mile trail run the next week.
Being in the group made it so much more enjoyable, plus the pace leader keeps me honest.
I also invested in a GPS watch ($190.00 from REI $158.00 on ebay) to help me when I run alone to really dial in the pacing. Another mistake I hear is folks not really knowing their pace, and then on race day feeling so jacked up they blow it out of the water and pay for it from mile 18-20 onward.
Finally, for me, I had to change the mindset around the long run - I had to really embrace it - it has become the pinnacle of my week. It's hard, and I hurt a bit afterwards, but if I go into it with anything less than love for the time I'm going to spend out there, my goose is cooked :)
Good luck, and let us know how it goes.
Remember: If it was easy, anyone would do it.
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