I did another correction and ran a +100% basal for four hours. I fell asleep accidentally, but thankfully when I woke up at around 5:00 AM I found I’d landed perfectly. (Those ups and downs are real, not just the sensor being inaccurate…I kept doing IM corrections, dropping fast, but then rising again as soon as the insulin wore off.)
Hopefully won’t repeat this anytime soon! I do wonder whether changing the timing of metformin played a role in addition to the carbs. My insulin doses didn’t change that much after starting it, but maybe stopping for half a day made my liver dump glucose like crazy and/or my cells super insulin resistant.
Also, relating to recent discussiosn about ketone testing, this is a perfect example of where ketone testing was helpful for me. I wondered if my site was bad, but when I checked ketones they were only at 0.3 mmol/L, which is normal (same as negative on the urine strips). So I knew that I was getting insulin, just not enough, and continued on correcting rather than changing everything out unnecessarily.