Its crazy sometimes how your sugars can change drastically with no explanation. Illness is a big one plus sometimes a change in weather can affect insulin. At least it came back down to a decent reading!
I get frustrated sometimes after exercise when I assume my bloods will be perfect. I check before going on a run when it might be 6 or 7. Then when I grt back it will have risen to 12 or 13. Only happens occassionally but it makes no sense to me. Ill get to the bottom of it one day!!!