70 isn't that low for a nondiabetic but everyone is different. If you are over weight and prediabetic 70 may feel lower than it should feel. My wife isn't diabetic but her sugar gets low at the same time your's does. Before assuming anything bad try having a little snack between lunch and dinner. Really not enough info though. If your job is physical that can make your sugar go low esp if you skip meals. Try to find a pattern. Are you skipping meals ? Stress actually raises blood sugar but low blood sugar and a little anxiety tossed in can give you that out of it feeling.
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