The Mystery of Subplot

I finally have a working title for this werewolf novel I'm writing. It's Chapel of the Wolves. I'm working on what I consider to be the seconed draft, although I haven't written all of the subplot yet. I'm thinking it will take 4-5 chapters to be interspersed among the main plot chapters, with some editing for continuity. I have compiled all the existing chapters into one file, and to my amazement, the printout is 270 pages long.

The suplot has been scaring me for two weeks now. I have an idea but not THE idea. But I've learned that, if you don't know what comes next, you'll probably find some answers in the early chapters of the book--things you didn't realize were there. That's why I printed the draft and am working on it--editing and gleaning ideas at the same time. I have a couple of good ones, so I'm feeling distinctly optimistic at this point.

The problem with writing is that I get so nervous that I won't have any ideas, I can't help eating massive quantities of junk. So I'm putting on weight. It's not a good thing. Any writers out there, if you have ideas about how to combat this, let me know. Thanks!