Eek!!!

My dog has some crusties on her skin and open sores with some hair loss. She has been itching and biting at her skin for a couple weeks. I started giving her some Benadryl following the dosage 1 mg per pound as recommended in the past from my vet. She's going to the vet tomorrow. I'm so afraid she has mange or allergies or even an immune disorder...this is my baby please send us good vibes!!