Yes, definately get a bee-sting kit BEFORE you inject again, You may be sensitive to something in the fina, how long after the injection did you break out? what area of the body did you break out in? Before you inject again get a 50mg IM shot of Benadryl and a vial of epinephrine 1:1000 and have 1cc of each drawn up in case you break out, feel short of breath, get palpations, flushing, dizzy, swelling around the mouth (lips) etc....
Anaphylactic shock can Kill in a matter of minutes and should not be taken lightly. I think you can most likely buy a bee sting kit without a script. If not get a Rx from your dr.
Dont take the fina for a few days and see if the rash goes away, if it comes back and you havent taken the fina than its probably not that.
good luck