If I develop anaphylaxis, how will it be treated?

Anaphylaxis. Epinephrine is the only proven effective treatment for anaphylaxis. There is no data to support any benefit from h1/h2 antihistamines or steroids. We give them to decrease the reaction but only Epinephrine is recommended in anaphylaxis. Give Epinephrine and call 911. Epi only has a half-life of 30 minutes.
Epinephrine. This serves to reiterate dr mutnick's answer the treatment for a patient experiencing anaphylaxis is administration of epinephrine. The data in the literature has been very clear those not treated promptly with Epinephrine are at further increased risk for bad outcomes.