While I was pregnant, I developed Gestational Diabetes. It wasn't a serious case and was easily managed by my diet. I am typically hypoglycemic and they think this may have had an effect.
Before I was diagnosed officially, I was definitely symptomatic. In the morning especially, if I had something too sugary (soda) or too carb-heavy (oatmeal), my heart would race. After the dietary adjustments, these symptoms went away.
7 months postpartum, they have returned.
I have always been a heavy carb eater because that was always the easiest way to control my blood sugar. I also love sweets (as you well know). But now it seems to be affecting me negatively.
My food is making me feel bad. Physically.
My plan is to go back to somewhat of the GD diet. Less simple carbs, more protein. I think this is a really important part of IE. It can be easy to eat what is comforting or just "sounds good". But listening to your body more closely can tell you some interesting things.