This hits close to home, having had my fair share of the condition too, now carrying the scars resulting of it. Though I've been lucky because for some reason going gluten-free has kept it somewhat under control. Actually went fully gluten, milk and sugar free at one point, but now I've been just keeping going on gluten-free and fortunately I've not had a bad breakout for a long time now.
It's really just terrible to suffer from it. Even when I was gluten-free I still had an occasional cyst appear and I felt so powerless thinking what have I done wrong, if I had eaten some wrong food or something.
So yeah, I feel you on this one.
I'm so happy to hear you found out what works for you and got it under control. I have been avoiding all three too, but not to the point of quitting everything cold turkey. I've done a good few weeks without them, but because I didn't see an improvement, I go FUCK IT, and eat everything, which of course is not good at all.
It's just feels so unfair that you have to use so much time and energy into thinking what you can and can not eat, in the hopes of having good skin. Most people can just eat pretty much what ever and be fine. My main thing regarding skin right now is to try and not to do too much to it, not to aggravate it and try and be more positive. Thinking constantly about the bad skin, is only going to lead to more of it.
Yeah, it can create a nasty vicious cycle. Hopefully it gets better.