I was having headaches frequently and decided to stop most of my vitamins and supplements for a while. During that time I had NO headaches. Because of other reasons, I had to go back on all my vitamins & supplements. Now my headaches are back. Today, even though it's not hurting as bad yet, this would be my 4th day in a row for this particular headache. So is there anything in the vitamins or supplements that could cause headaches, or is there any particular one that's known to cause headaches. It's a mystery to me that I need to solve. Thanks for any info or advice in advance!