My husband gets an infrequent, excruciating sharp, stabbing, throbbing pain on the right, upper, back portion of his head (brain). It lasts from 5 to 20 seconds. He's had maybe a few or so in the last year. It's been happening for about five years. What could it be?
From your description, these could be ice pick headaches. You can find some information about that type of headache in Ice Pick Headaches - The Basics.
There are several different symptoms that can be a result of migraines, including those that aren't frequently discussed. It would also be wise to keep track of what may be triggering these symptoms so you can eliminate them in the future.
That said, nobody can diagnose via the Internet, and unexplained head pain should always be investigated. Please encourage him to see his doctor about these pains so that he can be properly diagnosed and be sure that it's nothing serious?
They sound like Ice Pick head aches. Go see a migraine specialist. He may prescribe Indocine. It's like key to a lock. If that does not work I don't know what to tell you. I have Ice picks! Ughhhh!