http://www.dropzone.com/safety/Lear...ndbook_-_Chapter_3_Flying_Your_Body__796.html
I find it a little funny that I'm looking up skydiving guides in order to commit suicide, but I found this guide with instructions on how to position yourself to go headfirst. Not sure how accurate it is, but you're the one with experience. It says bringing your arms back a few inches (slightly holding them to your sides, I imagine) and extending your legs will help. I don't know if this will work.
Hope this just doesn't make me backslide. Obviously, mid free-fall, it'll be too late. Anyway, I read your story too
@chronicpainnomore and I'm so sorry. I have a chronic illness too and it's the only reason I want to go. But there's no cure for my condition. It's so sad that there's at least a treatment to ease your pain, and doctors haven't helped you. Especially since you're a veteran. You don't deserve this at all. I hope someone helps you before it's too late.