<<Disclaimer: Verify this information before applying it to your situation.>> I too am bothered by severe lower back pain, both sides. I have always awakened in the morning with stomach pain...wouldn't know what it was like without it...until the GF diet. Now I have lower back pain for days at a time then it disappears for a week, then returns just as suddenly. I am a strict diet watcher for gluten. Could we have kidney problems or pancreas insufficiency?