I had come recently for Das Mahavidya course and since then and anytime I do Sadhna, my third eye keeps vibrating. It is giving me a headache plus makes it difficult to do Sadhna - as right now I’m doing it with open eyes to read mantras and then have to concentrate on chakras. But third eye is vibrating so much that I cannot concentrate anyplace else and also have constant headache. What does this mean and what do I do?