Does stress kick pain and scalp psoriasis into overdrive?

I’ve been happy with the fantastic gains I’ve made over the last few months with both pain and scalp psoriasis by following a restrictive diet, taking supplements and treating my scalp with oil. The improvement has been spectacular. But this last week I had a few days of extraordinary stress and its like I slipped all the way down the hill to where my joint pain is as bad as it ever was for the last few days and today, my scalp is a giant white plaque flaking all over everything like just the bad old days. Could this be from the stress? Can it cause this extreme of a response? I’m questioning whether it’s because I missed some of my normal supplements and had a medium sized diet cheat. How badly does stress affect your symptoms?