Sarah, I can't comment on your situation but just wanted to share what has happened to me over the last 8 months.
Every now and then I would wake up early in the morning feeling so acidic and desperately needed to eat something. I had regular heartburn after evening meals too. This progressed as time went on until eventually I could not eat certain foods such as spicy or acidic.My situation got worse over the months and antacids were not enough in the end. I wasn't able to eat much for weeks and lost lots of weight due to the symptoms.I now have pump proton inhibitors to stop the acid.
This doesn't help you I know,but I feel as though my symptoms have been a wake up call to make me change my diet and eat more sensibly. Do take care of what of you eat and I think you will be fine. It is a case of working out what is best for you. I have just started a low carb eating plan. You may have read about this in other posts such as Dr Norms. 
I will be interested in hearing about your experience with this diet plan. Please post from time to time and let us know how you are doing.
I wish you luck.
Norm Robillard
I am a Ph.D. microbiologist and author. I am not a physician. The views I express, while research-based, are my own and should never take the place of consultations with your own physician.
My symptoms can be very inconsistent too. For me, the biggest difference is if my stomach is empty or not when I eat those "bad" foods. I seem to tolerate them alot more on an empty stomach. I know I sound like a broken record, but I think for us females, our hormones come in to play sooooooo much.
Also.....sometimes I think I have a sliding hiatal hernia, and if it's "up", then I get all the bad symptoms. But I don't get them if it's "down".
Why don't you keep track of your cycle.....and see if you can find any correlation.
Also....might it be a combination of foods?? At least there are some times when you can get by eating the bad stuff!