i wish you luck.
my suggestions are fairly basic: crate train. start working on leaving them in the crates longer and longer each day. work on mental stuff (training for new things) prior to leaving, so they’re tired, and leave them with a stuffed Kong.
i would also go back to square one with the mix you mentioned, and i would invest in a corrective collar and the training to learn how to use it properly. (corrective collars, in this case, would be Martingales and pinch collars – no full chokers.)
Call your vet back, she needs to be re-examined!
Any helpful suggestions?
Honestly, without examining the dog it is difficult to give recommendations, however a steroid may help decrease inflammation. Was blood work done?