You might try purifying it and then binding it to yourself. A previous owner may have bound it to themselves, and the artifact is thus attacking you, because you are not its owner. You would need to strip it clean and then rebind it so that it stops attacking you.
That, or it is simply the nature of the artifact. Try not wearing it during the day, so the headaches and light sensitivity don't effect you during the daylight hours?
Its hard for me to be sure what is the exact reason for its reactions in you without being physically involved with the artifact to study it.