DK,
Couple thoughts:
Try taking the allopurinol at a different time of day and see if your headache reschedules itself.
Skip the allopurinol and the anti-inflammatory for a day and see if you stay headache-free for the whole day… don’t worry, after 2 days you will still have copious oxypurinol to tide you over.
It might be possible that you are suffering from analgesic withdrawal.
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