could any one tell me why not to drink milk ??

could any one tell me why not to drink milk my last appointment I got back my blood results they told me that my blood is low and my blood sugar is high they told me if I drink milk my folic acid and my iron tablets won't work am confused because my mom told me I could drink the milk and nun won't happen because milk is important to the body ,so I don't know who advise to take could anyone help me out here.