If you are meditating and a headache, or some sort of painful feeling in the head, starts to arise, yes, it’s probably because you are trying too hard.
Remember, meditating and letting go of hindrances is not supposed to be a fight.
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6R it once and Return to the object of meditation.
You aren’t going to eliminate the headache or tension in one go, but you can Release your attention from it.
If attention keeps returning to that tension, you are basically feeding it, making it stay or even get worse. If you leave it alone, the tension will diminish on its own. Understand that this is just a painful feeling. Use the 6R’s, but only whenever your attention gets drawn to that pain again.