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I have difficulties with lactose too, but can handle yogurt and cheeses just fine. So for the milk I substitute coconut milk and it tastes the same (and the calcium you'll lose from this sub is insignificant). But I've no idea what to replace the yogurt with and keep the flavor profile intact! Or retain similar calcium amounts.

Thought I'd share this table with coconut milk replacing cow's milk. The red numbers are the ones on the packaging of the canned coconut milk brand I use, the rest are for real raw coconut milk from here: https://en.wikipedia.org/wiki/Coconut_milk To make the image larger you can right-click and click on 'view image' for firefox, or the equivalent for other browsers.

coco.jpg