Bound to be the glic. if it is your medication to blame. Pretty sure your Doctor will want to reduce the dose . Try to use the situation to get him to prescribe strips.
Are you having the hyopos at any particular time? Proves the importance of testing. For all you know you could be experiencing highs and lows averaging seven.
Without more information your doctor will probably be guessing too .except ,as Viv says ,metformin is not hypo -inducing.
In my experience the word "hypo" is very effective in making them sit up and take notice, I doubt that reducing the metformin would have much effect ,if any.
Its worth a try with the test strips- good luck!