I asked this very question to my own doctor.

My doctor advised that it is alright to treat the headache with pain medication, but then one must stop the activities, recognizing that the headache was indicating a need to rest.

I find that I tend to just try to tough out the headache if possible, and that way I'm not tempted to continue to overdo it with cognitively demanding activities.

It is a challenge to manage, and I wish you good luck.