I don't have any personal experience with this, but ... my sister has a pretty serious acid reflux problem and dairy products are the worst thing for her. She says cheese doesn't seem to bother her, ice cream seems to be the worst, and other dairy products fall in between. Don't know if it's actually the lactose that causes the problem (but I s'pose that would make sense).
As for the ice cream problem ... just spent the long weekend with said sister and her family ... my nephew is lactose-intolerant ... we had Breyers lactose-free ice cream for dinner Sunday night. My nephew said he has no problem at all with it. So consider that option. Don't know if they make it any flavors other than vanilla ... but there's always chocolate syrup.
Good luck!
Shelley
aka newbiechick