Our 16 month old Bull Dog broke our in hives & red splotches all over her body on Thursday. The vet gave her a steroid shot & we have given her benadryel (not much). She has become very lethargic & is now throwing up frequently. Of course we are very concerned. Ever heard of these symptoms? Help

Time to give the vet or emergency vet a call.
I'm sorry that is all the advice I can offer, benadryl doesn't usually cause problems it can make them drowsy, but with the vomiting on top of that your best bet is to touch base with her vet.