I feel sad reading this ;A; I have GERD so I have to cut diwn on many kind of foods too, kinda know how you feel. About the teeth shaking, have you checked if your magnesium intake all these time balanced the amount if milk you drink? If not than the calcium will just be a waste in your body and can cause more harm than good. I hope you can find a way out in your meal balance to decrease the lactose intolerence!!