Do not quote me on this but:

Yoghurt - yes (great source of calcium and good for heartburn and thrush!!!)
Cream Cheese - yes, I read somewhere the yes and no cheeses and cream was a yes. I wanted to make a cheesecake so wanted to make sure I would be ok about ricotta, cream cheese and marscapone so I hope it was ok LOL

Cottage Cheese - I may seem a litle ignorant but is it in water?? If it is then its a no

Sour Cream - good question

Pavlova - I argued about this with my chef friend - she says yes because it is cooked egg, I said no coz the cooked part is only on the outside so it will be interesting to see what others say.

Ham on Pizza is cooked as long as it is cooked very well go for it.

Not to sure about the rest so Ill let someone else answer for you.