I Had An Allergic Reaction Yesterday, The Doctor Gave Me

I had an allergic reaction yesterday, the doctor gave me an epi shot and a shot of methylprednisolone, then he perscibed the methylprednisolone for the next 6 days. I am still week and shaky and every once in a while my heart beat feels irregular. so i go in to the hospital, it feels like it is still from the reaction yesterday.