wasp sting

I would say that shock, pain, toxins and other stresses often affect blood glucose, so yes, it is fairly normal.
(other factors are exercise, sleep, lack of sleep, food intolerances, grief, other illnesses such as colds and flu... the list is pretty endless!)

I wouldn't worry about it unless it is a dramatic shift that lasts for more than a few days. At that point you might want to take medical advice in case something else is going on. And of course, take medical advice if your wasp sting gets worse and looks like it is turning nasty.

Hope that helps.

It is possible that the injection you were given was a steroid (I was given steroid cream when my cheek swelled up due to an allergic reaction).
Unfortunately, steroids are one of the things which cause our BG to rise.
This impact may hang around for a few days but, hopefully, you will go back to your normal levels soon.

Fingers crossed your swelling and itching has gone (a wasp bite sounds horrendous).

There are many things which affect our BG as well as food and drink: exercise, drugs (as you have seen), stress, ...
It is possible the stress of your sting was also causing your BG to rise.