Jennifer,
First of all you should be calling your Doctor with this kind of ?
I wonder if it may be some sort of acid reflux. Sounds like it if food helps and then it comes back and not being constant is another clue.
Call your doctor and ask, It can't hurt.
May God Bless you and Yours
__________________
Dave in NY 
You choose your attitude each day, Choose well !
387---/ 311-------------- / 167---/ 175
Oct.06/ surgery02/12/07/Current/goal
Reached Goal 10/20/07 Wow what a ride
225 LBS. down and 0 LBS. to go 10/14/08
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