I think I was stung by a bumblebee or maybe a hairy footed flower bee, which is good news for both of us. Good for the bee because these species are able to withdraw their stingers, unlike honey bees, and so live on. (I guided this one out of the bedroom window.) Good for me because it was only a mild sting (it felt like a major pin-prick) and the pain was never serious and subsided within a few hours.