What do you do when you get stung by a bee and your allergic?

If it is definitely a bee sting and not a wasp sting, the first thing to do is remove the barb because as long as the barb is in your skin, the venom will continue to pump into your body. (A wasp doesn't leave the barb behind.) You could then try a proprietary brand of antihistamine. You will have localised pain and swelling of the surrounding area, the severity of which varies from person to person. Wasp stings tend to be more painful than bee stings, but get the barb out!