For the last couple of years, I have noticed that when I eat certain foods, I feel pain/pressure at the base of my skull. It is a dull ache that seems to center around the very top of my spine and lower brain (cerebellum area?). It feels like the whole area swells, I feel pressure and pain that lasts several of hours at least. Anti-inflammatories help somewhat. I know these aren't symptoms of a food allergy but it occurs within 15-30 minutes after eating specific foods. I don't feel any other symptoms and my doctor looks puzzled when I bring it up. Any ideas?