I did most of the design for this app. I also suffer from bad acid reflux right now, and designed this app for someone like me. :)

A year ago I figured out separate, gluten-based problems by using iCal in this manner: log meals in blue, symptoms in red, see what I've eaten ~24 hours before a red entry.

Right now this is a nicer and more focused version of iCal or a spreadsheet for this purpose, but we're planning on adding some correlation analysis similar to http://skygazerlabs.com/wp/

This is going to sound seriously snarky, but I promise it's not and I am asking a genuine question out of curiosity:

Why would this help you fix your diet when all the other ways of tracking anything (notepad, the above mentioned spreadsheet, journal etc.) apparently hasn't?

Trying cutting down on wheat based foods. If you are troubled at night, don't have any dairy before going to bed. In fact have your last food several hours before going to bed.