What was the result w/ the flea bite situation...? That would take some time before evaluating.   
Did you see a Derm yet?   
I've never known of a dog itching severely due to anxiety. But if that were suspected in my dog, I'd most definitely get a prescription med ASAP on board...one that was fast acting -- bc you'd want to see its effect asap in order to rule in/rule out the anxiety suspicion. I would not place my hopes in something natural and unpredictable and unproven when you still don't even know for sure what's going on here. It will just add more and more confusion to the situation and it won't add to definitive diagnosis.     
				__________________  ~ A friend told me I was delusional. I nearly fell off my unicorn.  ~    °¨¨¨°ºOº°¨¨¨° Ann | Pfeiffer | Marcel Verdel Purcell | Wylie | Artie  °¨¨¨°ºOº°¨¨¨°      |