Very frustated and tired

Anything below 4 mmol/l is considered hypo territory and should be avoided.

Were the readings pre or post meal ? I often get a fasting(waking) Bg of 4-5 which is quite normal.

Ken

When it is low it is usually because you have not eaten for a while. Do you eat regular meals, maybe have a snack as well to keep levels just a little higher to avoid the hypo area ?

There may be other causes but I would address this area first and see if things improve.

Ken

3.8 very worrying.

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I don't think that a one off reading of 3.8mmol should worry you unduly. Firstly, meter readings can easily be 10% out. A bg level of 4mmol could register on a meter at anything between 3.6 and 4.4.
Secondly, you had a tiring day, you used up your fuel and needed to eat. You are not in danger unless you are taking insulin or medications such a sulphonylureas which can derease your levels further. As Ken says try eating a small snack on a hard working afternoon to keep your levels from dipping too low.