Yeah, I do believe stress has a lot to do with it :) My very first "flare" happened right after the birth of my firstborn. Interestingly, it was immediately after the birth of my second that one of my flares vanished, overnight. I don't need to tell you that have UC and being a teacher is no fun, since you are told when you are allowed to go to the bathroom.
I had UC symptoms for 8 years before I stumbled upon the fungus link "theory", actually from the gentleman who has done much research on fungus, from the knowthecause website. I decided to try the antifungal route as nothing else worked, and it did make common (and scientific) sense to me after reading up on it. Really not expecting I would get better (my doctors told me I would be wasting my time), after 2 weeks of strictly following it, along with taking mega-doses olive leaf extract (a natural antifungal), I felt like a new woman. I continued on a phase 2 of the diet for probably the next 4-5 months, allowing myself "treats" from time to time, as well as continuing my antifungals. You need to rotate them monthly, or the fungus gets smart! I rotated with caprylic acid or a yeast cleanse supplement containing a compilation of antifungals.
I say, experiment with it for a fair 2 weeks, with the antifungals, and if you notice improvement in 2 weeks, you can suppose your condition is fungal. Then you can continue on that path. Be careful, however. I felt so much worse when I first started (fungal toxin die-off). Not everyone experiences it, but be ready in case you need to take a few days for yourself. You may have varied flu-like symptoms, aches and pains, major D, headaches, foggy brain, etc. Hopefully, you won't have that, but if you do, it is another indication you probably have a fungus problem. Today, I am symptomless and med-free.
Today I also take probiotics, which I highly recommend, and beta-glucan, an immune booster. I don't take the antifungals regularly anymore, but now and again, for maintenance. I eat pretty well most foods again (except yeast-containing ones) in moderation. I do limit sugar as I know it is not good for me. I know this is the path I must take, but that's alright with me. Much better than running to the loo every time I turn around :)
Good luck. You can email me if you like for further clarification, or just some support if you decide to try it.