You are right; certain things seem to work for certain people. Not one size fits all. But, I guess one never knows what will be key for overcoming IBS symptoms if one doesn't at least experiment with different things. I never believed something as simple as an antifungal diet would alleviate my symptoms, until I actually tried it and within 2 weeks, I felt so much better. I know it still stands for me today because when I veer too far from the basics of the diet (eating whole, natural foods instead of processed, high-carb starchy foods, especially foods with yeast ), I get those tummy gurglings and episodes of D coming back. If you do try the diet, only eat from the list of recommended foods those foods that don't bother your IBS. I could not tolerate all foods from the list when I first started the diet, and even today, I can't overdo some of them....lettuce, tomatoes, grapefruit, onions., etc. As well, you may feel worse before feeling better during the first week of the diet as the toxins in your body are dying and being released. As indicated on the website, I also took natural antifungals (olive leaf extract and caprylic acid) to help clear my body of any fungal toxins, as I didn't feel changing diet alone would give me the results I was looking for.
There is a phase 2 part of that diet that allows you to eat oats, millet, quinoa, barley, yeast-free bread, yams and brown rice, so you don't feel so limited on food choices as the phase 1 part of the diet dictates. I can eat yeast-free millet bread, or yeast-free tortilla bread with no problems.
Keep in touch. No matter what you decide to try, I hope you find something that helps you be able to take that vacation :)
Just wondering...you don't eat/drink foods with artificial sweetener (Splenda/sucralose, aspartame), do you?