Does your regular dose of immodium usually do you, or do you frequently still have some problems and need to take another one? If one always fixes you up, I'd say just take one. But if you sometimes need two, I'd go ahead and take two. Before I went down into Mammoth cave, I took two and a half or three and I was usually just taking two a day. But caves don't come with bathrooms... not even dismal ones. So I couldn't take the chance. I don't know about other people, but I tend to pay for a day's indulgence the day after rather than right then. Make sure you plan on not doing anything Sunday.
I think the reason why beer is hard on the stomach is because of the combination of carbonation, high acidity and alcohol. Hard liquors and wine don't have the carbonation and I don't think most liquors are very acidic, once you get past the alcohol. And like I said, they are strong enough that they seem to relax the gut. There was a lady on here once who said if she didn't have a shot of vodka everyday before eating, she had diarrhea. Someone else was mentioning that Rx pain medications kept them from having diarrhea, etc., so I wonder if both things have an ability to mellow-out the guts so they stop overreacting to every little thing. If you think about it, no one ever has a beer as a nightcap; brandy or sherry or wine only. So I guess beer doens't work as a relaxant the way other alcohols do, so it doesn't help you tolerate it some better.
And make sure you ask around at the bar and see if there aren't some social clubs for gays that don't involve drinking and wild partying. I've heard of some biker groups if you like motorcycles, and I'm sure there are other hobby groups out there that do something you like to do. Even gay people can't live like they're in college for the rest of their lives; they have to have something to do that's tamer and yet social. I've recently read that gay retirement communities are coming into vogue, but I don't think you're old enough to start shopping around there. But, you never know; you may find you like hanging out with older people and playing bingo and croquet and just being social, if not attached. I'll tell you what I told my desperately single friend from high school: get a hobby, get out, get social, quit thinking about finding someone. As soon as you do, you'll find someone. It's what happened to me. Not three weeks into getting into medieval reenacting, I met my fiance. And I had been desperately pining away for the love of my life for years too. I finally decided he'll be here when he gets here and I'm going to stop obsessing about it, and there he came. IBS kind of works that way, too, I think. When you stop fretting over it, it eases up.