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CASE 1. You're telling in a letter to a friend that last week you were affected by a strong headache. And you write: בְּשָׁבוּעַ שֶׁעָבָר כָאַב הַרֹאשׁ לִי

Then the doubt assaults you whether in the hasar niqud you have to put a waw within the noun הַרֹאש

Looking at N-t123 you find the answer.ׁSo, you will write בשבוע שעבר כאב הראש לי