The first 48 hours

As of now, I have completed the first 48 hours without a problem.
I didn't feel hungry, I didn't crave sugar or carbs, I avoided the home baked dessert someone left in the break room at work yesterday. Down 5 pounds already, but with drinking 4 liters of water a day that was to be expected. No loss of energy, either, and I found myself struggling to eat all my calories both days. I am keeping track of everything in My Fitness Pal, and I royally messed up day one by putting a banana in my spinach smoothie- force of habit, and it wasn't until I was entering it into MFP that I realized how many carbs are in one little banana. It is strange to be using butter and cream, and the most difficult part has been the fruit. I have always eaten tons of fruit, in great variety, so limiting that was a drastic change. Lucky for me, I live in the Northwest and we just had decent blackberry summer, so I had already picked and put up a few gallons for later, which I now realize is pretty much now-berries don't seem to have as much sugar/carbs as other common fruits.
And here's the downside: I have had a little bit of heartburn at bedtime both nights. Just like a greasy taste in the back of my throat when I first lay down that goes away as I drift off to sleep. I don't eat anything for at least an hour before I go to bed, so it's not that. There's probably an easy explanation, and as soon as I have a chance, I will talk to that group of wise people that are helping me along the way.