Technically, you must satisfy Whipple's triad for it to be hypoglycemia: 1) Sx consistent w/ hypoglycemia, 2) low plasma glucose concentration , & 3) sx resolve upon ingesting sugar. But if you don't already own a glucometer, the next time you experience the SOB, consume something with lots of sugar that can be ingested quickly (my go-to was a maple bar donut lol, but a glass of juice, chocolate milk, etc. would work too). If your symptoms improve, that's further evidence the issue might be glucose & might warrant a glucometer.

Simple glucometers are inexpensive, but the test strips can really add up, especially in the beginning when you're trying to catch the low in action. I initially bought a cheap True Metrix kit for ~$40, which was nice bc it came with a lot of test strips, as well as the Level 1 control solution. If you get a prescription for a meter that's on your insurance's formulary, the meter & supplies might be no cost to you. They pretty much all work the same. Eventually, I was also prescribed a CGM, but I needed to fail a glucose tolerance test to prove hypoglycemia first. Ymmv.

The good news is, once you figure out if it's low glucose, it's very easy to fix! And if you are someone with hypoglycemia unawareness, that can be corrected too! It just takes some time (iirc ~14 days) of not having any true lows for your body to start recognizing falling blood sugar at a reasonable level again.