I have it, I have no idea what makes it flare up to be honest
I drink lots, I eat spicy food, I do all the wrong things, it just seems to come and go, I haven’t had an issue for a while. I believe this is mainly down to having a cream I got from the doctor that I apply when it starts to show and that helps to keep it at bay. When I first started my new job the air conditioning seemed to really bother it 
When I first found out I had it I also changed some of my make-up (foundation and concealer) from liquid to mineral - I’m not sure if this made any difference but it felt less cakey, a lot more light, when I was having a break out. The most recent moisturiser I bought has an spf which they always say is good for people who have rosacea because sun exposure = bad.