emmie here, remember me?
Actually, I'm pretty sure that what usually provokes a Raynauds attack is either cold or emotional stress. Most of the time it is the cold. Rosie is right that it is caused by constricted blood vessels, but it is cold that makes things constrict; heat makes things swell.
Also, i think it was you that posted something aabout
hashimoto's encephalopathy a while back. I can't remember exactly what it was but this is what I am under the impression is one of the current theories of what may be the process. One of the symptoms of the disease is very high thyroid antibodies. It is considered an autoimmune disease in that somehow the neurons in the brain are randomly attacked (the body turning on itself). If you google hashimotos encephalopathy you will find a few sites that give symptoms. Like most AI diseases most people have all of the symptoms. There are also some published papers on HE. The downside is that since there are so few people who have it (diagnosed anyway) that studies are nonexistent.
Sorry to hear you're still having trouble with the sun. So many of us do. Take care and I hope you find a way to get some fresh air--maybe early mornings and in the evening?