Hi Robin. No need to be sorry. Not long at all. Anyway, we need to know stuff to help.
I would be thrilled if my blood sugar was 86, or even 96 if that's the true reading. It is a lot higher despite large doses of Metformin.
Full fat dairy, the only kind I would consume, can make you insulin resistant. It did me. One meal of sushi and two slices of bread shouldn't do anything lasting.
How many carbs are you eating? Low carb can make you insulin resistant. It seems to have done that to me. (Vicious circle - I ate more and more fat, esp. dairy fat, and fewer and fewer carbs. And my glucose shot higher and higher.)