This is actually pretty common down there. Ordinarily they bore into the flesh of cattle, but if you’re unlucky they’ll get you too. I saw a program on the Animal Planet where this guy had them on the top of his head. He could hear noises too, but everybody treated him like he was nuts, since they were only active certain parts of the day. It wasn’t until maybe a second or third doctor finally noticed... “uhhh, these bumps on your head are moving.”
Bottle fly larvae?