Hi guys, I read this post and a certain illness is jumping out at me and that is giant cell arteritis. Someone said in a post 'I think it's vascular' and I believe that's right. I have a form of vasculitis and suffer extreme headache, fatigue, blurred vision, neuro symptoms. A lot of different problems. Also my skin on my scalp and elsewhere is infused with a sort of neuralgia pain. It is exhausting. I am sorry if this didn't post correctly. I'm new to using iPad so not very good with it. But if it hasn't worked please google the topic.....lotsa stuff online about it but I think it's a strong candidate.