How exactly do you get an epipen?

My husband was stung by a bee today and had a pretty ugly localized allergic reaction. He went to medical at work, they gave him a tetanus shot and two benedryl.

I thought (and the doctor at work also said) that this means that the likelihood of his next bee sting causing a more severe allergic reaction increases. Is anaphylactic shock something that we should anticipate as a possibility? If so, do we need to get an epipen, and how do we go about doing that?