Mornin' Tracy:  Unfortunately I have NO idea of your control factors but will offer "food" for thought.   Your week of highs  ...........   presume you have & abide by the ** correction ** factor??   Abide by the food / carb ratio??  In theory if the correction factor is calculated & administered correctly a high should be within normal range 3 to 4 hours later.  Do you have an infection ??                 Your "low last night"  ..........     the time is very important to even suggest a possibility    ..............   cutting carbs or over exerting because of highs??    There are (or appears to be) too many possibilities in this "cake mix" to call one item the culprit.           My suggestion  ........  take a close look your control administration.       Sorry for the last sentence, no offense intended, one MUST look "in house" first.  

Bestus wishes