Awhile back I make a Coopers lager kit. The quickness of this kit won me over, when I'm short on time. The only problem was if I had more than 1 beer, I got a stomach ache. My guess is that it might be the yeast. So, I'm wondering what would the closest type of yeast to substitute with. I understand that it's not a true lager yeast, so would Nottingham be closest?