Are they as vibrant so far up north as they look? We recently could see them here in northern Germany, but they weren't directly above us, but far away. They looked more like fog banks that twinkled sometimes far out at sea, and if you didn't know what to look for, you'd overlook them. They only looked a bit more colourful on photographes, and vibrant only when the photograph was reworked. To me in reality they didn't even look as greenish nor lilac as in the 2nd, non enhanced picture (yes the quality is bad, I shot it with a cellphone without tripod). But I heard the more north you go, the more vibrant the colors look.

My guess is some mental health disorders, or their severity, are also symptoms of something physiological (from vit D deficiency, thyroid problems, to whatever else). Another guess was, people with mental health disorders experience more stress, maybe they have more cortisol in their blood, which might also make vulnerable. And depression for example also is linked to a heightened white blood cell count in some patients. I think there's more to 'mental' health than we know of today.

Sound like side effects of a migraine without the typical migraine pain, which can be a thing. I developed a severe form of migraine after. Maybe have a look into it.