Are you allergic to calcium? If not you could try coral calcium (Bob Barefoot's blend)also nuts and seeds and other high valcium content foods. I understand that the milk actually may pull more calcium from your bones to neutralize the acidity from the milk. Do you drink coffee, pop and smoke cigarettes? Calcium depletion can be caused by these due to their high acidity. Meats as well cause acidity.
The Calcium Factor by Bob Barefoot would be a good book to read.