A gastroenterologist will be the one doing your scope, so you should have an appointment with him/her or another GI afterwards to go over the results and form a plan from there. You might give an antispasmodic another go. If it gives you C, you could try cutting the thing in half and that might work well.
Dairy products and alcohol are typical irritants for IBSers, certainly for me (doesn't stop me from imbibing now and then, but I take it slow ) Have you ever kept a food/symptoms diary? Track exactly what and how much you eat/drink, then write down how many BMs you had that day and describe the pain as best you can. Do that for two weeks at least. Your GI will thank you! It's amazing how patterns can emerge when we don't think there are any patterns but just pay closer attention.
It's good you're getting another scope, sometimes things change over the years.