I have cluster headaches for 25 years and after attacks my brain becomes 10x sharper and I feel high . I remember few times I had my headache during 4 hours long university exams and I was sad that I am going to miss the exam but after 45 minutes that headache finished I solved all questions and got the first rank. I feel like flying and have 100% control on my brain when this happens ... I believe it can be both chemical and metaphysical