Where did you get the testing equipment? I tend to get very cold if I haven't eaten recently, if I'm not active -- always have -- and it would be fascinating to see if there's a connection.
Not sure where you're located, but the Walmart brand Reli-on testers are as accurate as any other brand you'll find on a pharmacy shelf, and have very reasonably priced test strips (glucose meters are like razor blades or printers, most of your cost will come from test strips, not the meter itself). I'm a T2 diabetic, and have a Reli-on Confirm. The device is only around $10 and the strips are ~$20 for a 50 pack or ~$35 for 100. It's a pretty good deal. Test strips the only thing I ever go to Walmart for anymore.
Reli-on Prime user here. When I discovered that I could buy the test strips over-the-counter for less than the deductible on the ones my doctor prescribed, I switched and never went back. $18 for 100.
I bought this for £12 a year ago. I see it's unavailable from that seller but you'll find it elsewhere. In the UK diabetics get these free. https://www.amazon.co.uk/gp/product/B004343VWS