I Took My 11 Year Old Dog To Vet For Seasonal Allergy To Flea Bites. She Was Fine Except For Itching.?

They gave her rabies shot, antihistamine pills. It’s been about a week, and she has had diarrhea, vomiting, lethargy. She has been back 3 times and been treated for this with cortisone shot, flaghl etc.and is still sick! When I mentioned reaction from the rabies shot or any of the treatments, they say no it couldn’t be. I am sooo frustrated, and need a natural cure for my dog! No more poisons, or medications for my animal!