Duncan, it's not lactose that causes reflux, but the PH level of the milk, which is the opposite of acidic. It causes your body to create even more stomach acid. I'd say away from it.
To the point that refluxmcgee is making, keep in mind that the more you focus on this, the worse it'll seem. Just like with everything else that doesn't goes as planned in life. The reason LPR is so hard to deal with is because it affects your breathing/swallowing at times and the body's natural reaction is to freak out. Been there myself. BUT, try to focus on your overall wellbeing, not the LPR symptoms. refluxmcgee, if you have vomit coming up to your mouth, then you might possibly not have LPR, since LPR is usually characterized by very rare "heartburn" or "acid in your mouth" reflux events. LIke me, I rarely ever have actual heartburn, only symptoms in the throat, sinuses, raspy voice, swallowing problems etc. I WISH i had "regular" heartburn or reflux, cause I think that'd be a lot easier to deal with.
What works for me is: lifting weights, going for a walk or gym when my symptoms flare up, improving my posture, chewing gum that's got sodium-bicarbonate (baking soda, like Orbit Bubblemint, etc) when I have the coughing and clearing the throat symptoms. Also, double up on the Nexium, cause there are many research papers out there stating that LPR has to be fought more aggressively than regular reflux in order to see improvements. That usually means double the "regular" PPI dosage (consult with your doc though before doing that). I used to take 2 PPIs (Nexiums) a day, then I did great for 3 yrs, and I went down to 1, and did great for another 2, then my LPR came back and now im back on 2 and it's making a difference. It's worth giving it a try. Good luck!