Baking soda. Basic rule, wasp and hornet stings are alkaline and need treating with acid like vinegar or lemon juice, bee stings are acid and need treating with alkali like baking soda.
Put a little baking soda on it. One got me last year too. A yellow jacket flew in there as I was driving ouchhhhhhhhhhh!
Baking Soda and water
I don't know I never got stung in the ear before.
Baking soda and a few drops of water and make it into a thick paste. Apply directly to the sting, you should feel almost instant relief.
Make a paste from baking soda and a little water, apply it to the sting, and let it dry there, this will pull the stinger out, and will alleviate some of the pain. If you think you are tightening up in the chest and the ear swells up, or you get hives, you need to call an ambulance, as you might be allergic. I benadryl will help you out too, you should take one. Hope this helps, good luck to you.
You can apply some generic hydro cortisone cream, but if you don't have any on hand mix a palm full of baking soda with about a table spoon of water. You can spread this around the area to relieve some burning and itching.
Well you can put cooling cream on it but that stings a little, but don't try to get the stinger out.