I suffered from headaches after a spinal tap for a myelogram. Ends up that they were headaches due to a cerebral spinal fluid leak. Is it possible that you could have a small csf leak from the spinal?
That's the only thing that I can think of that might be "directly" connected to a myelogram. My headaches went away when I laid down.
I'm not saying that you have this, but it might be worth bringing up with your doctor if they are spinal headaches.
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