HI Anna,
I haven’t read all the replies but the chips might have been the major factor in the spike, potato behaves like a sugar, it spikes really really quickly. The pizza may not have helped but it’s most likely the potato which is to blame. the bread in pasta is not so bad. Blood sugars are sadly often a mystery, there are so many factors at play so you hadn’t done anything wrong… stress, food, illness and the amount of insulin all factor in a result, so don’t freak out just be careful, not eating the cake is a good option, also ice cream is actually quite slow acting as long as it is plain , like vanilla. So you could have had a bit of that if your blood sugars weren’t so high. Good on you for testing before hand. Well done. And don’t worry too much you’re doing the right things.