I have found that I can eat ice cream if I drink 6-8 oz Lactaid milk immediately afterwards. It works for cheese and yogurt too. I do have to watch the really thick yogurts though. They must have added dry or evaporated milk - which contains sulfite. I have found only minimal value in the lactaid pills unless I take a whole bunch of them well before eating lactose. Unfortunately the liquid seems to not be available any more.
Of course Lactaid doesn't help people who are intolerant to casein - the milk protein.
Since I have a sulfite problem I don't tolerate soy products or processed coconut or almost any cereals.
Now somebody find something that actually works on gassy vegetables!