I'm lactose intolerant and I ate a burger that had a lot of cheese in it. I am up at 1 in the morning with stomach pains(gas I think) so bad that I can't even go to the bathroom.I took 2 Lactaids thinking it would help. How long does it take the Lactaid to work? I'm 15 and I have school tomorrow so I need to get sleep but I can't. And it seems I only get the pains when sitting down or laying down.