Yeah beer can deffo do that to yer. Is it a ‘live’ beer, IE, not pasturised? I find some real ales can give me terrible wind. Terrible wind. Giving you the runs is a bit worser though. Might be worth having a word with the brewery you know; might be a bit late, but if it is their beer, then they could be in all sorts of trouble if there’s something contaminating it.
It could be just your reaction to it. Maybe try another bottle; if it has the same effects, but not on others, then you know it doesn’t agree with you. Could be some reaction you have to the yeast or something like that. Getting the runs suggests a bacterial infection mind.