Hi. I've recently become lactose intolerant, I thought it would be a real nuisance, but no, most places do a version of lactofree milk.
It's really nice, use as standard milk, no lactose obviously, so doesn't affect your blood glucose reading, and fewer calories. Sorry don't know the amount as I don't calorie count. Arla make the brand Lactofree milk and in Asda in their free from chilled section they do a 1 & 2 (not far short of 4 pint bottle) litre carton of lactofree milk.
I suggest you avoid Oat milk as that tastes like a very runny unsweetened porridge. Hope this info helps you. Lactofree milk is regular dairy milk but lactose free & has Lactase Enzyme in it, which your body uses to allow you to tolerate lactose. Arla lactofree milk is available in full fat and semi skimmed varieties.
Good Luck