Ah, thanks for correcting me.I hate to be that guy but...
The OP was saying while the doctors were all concerned that the heart problems were because she's fat, the real problem went unnoticed and untreated the entire time - that being WPW, or Wolff-Parkinson-White Syndrome. While it isn't precisely what OP claimed it was ("a tiny hole in the chambers of the heart") it still sounds like what could have caused the issues.
http://my.clevelandclinic.org/services/heart/disorders/arrhythmia/wolff-parkinson-white-syndrome
The post itself looks to have been reblogged by Sugar without commentary.