I have mvp too and totally relate to your sensitivity levels. The books I've read on mvp actually recommend cutting out sugar, chocolate, alcohol, aspartame and glutamine. When I started lowcarb my heart arrythmia decreased in frequency about 85%.

I am biased and believe lowfat is a nonsensical diet method. I feel best and love eating lots of chicken, fish, vegetables and nuts. I like my carbs 40-70 a day. It just happens to not be highfat.