I went through this a few years ago about mid way through the menopause. Stopped all dairy products and started using Lactose free products. This helped settle my tummy, the acidity and nausea feeling. After a while i started to reintroduce dairy products again and am no longer taking lactose free. The only thing i have to be careful with is cakes which can give me an upset tummy, not being a great lover of them, they are easy to avoid. I do however take Soya milk now and again just to give my body a break from dairy, i like this milk so again this is easy for me.