Head pain is often associate with cervical problems, @parus. I suppose you've mentioned the head pain to your docs? If not, do so.

I hope you get some pain relief soon!! You might try some ice and/or heat on the back of your neck and see if that helps. Perhaps an OTC lidocaine patch? Those are my go-to remedies for that kind of pain. Might be worth a try? (If all else fails, rub a little Vicks on your neck - my standby).