a couple of months ago my girlfriend found out that she was lactose intolerant as well and since then we buy everything lactose free for both of us where possible and to be honest even I am feeling the positive changes... so were are sticking to it (only some cheeses are hard to replace)
and milk also contains a lot of sugar... so check out this https://steemit.com/health/@felander/are-we-all-dying-sweetly
if you combine these tips with your lactose tips then life should get a lot better