Horror Writing: A Challenge

As I write my first horror novel for NaNoWriMo, I had the mishap of finding road blocks. Sometimes they are small and easy to avoid and other times they are not so easy to avoid. For instance, i ran into a scene where I wanted to my main character give a powerful speech to the residents of Jasper Mills (the setting where my novel takes place) and, I could not invent his speech. So, I set it aside and slept on it. Then, in the morning, I thought three choices to solve this problem. One was to scarp the book and start over with on a later date. I didn't choose that. The second choice was to re-write the scene and keep the speech. I didn't choose that either. The last option was, and the one that i did choose, to keep the scene and wait for the right moment for my character.
When i did that, I choice I came up with a scene that fits what I wanted to do all long. . That the first problem of writing horror.

Another challenge of writing horror is precisely that creating the elements that will scare the reader. I think I have that down pat, sort of speak. However, ensuring that there is suspense is a feat that I am slowly overcoming here.

My question to all of you is two fold, and is not genre specific. One, how do you overcome "road blocks" and two how do you handle suspense?