I also get a burning sensation in my tummy in the morning after an evening dose, but then again, I have gastritis from 20 years of anti-inflammatory use, so it's no surprise.
Like me, you'll probably find eating something soon after waking (within 10 minutes) will stop the pain from occurring altogether. I too agree that the Miracle-Mineral-Supplement is probably pretty hard on the stomach, especially if you have a delicate stomach to begin with.
Just eat something prior to getting that burning sensation and you'll be fine.