Thanks for the reply everyone!
Good news - I have booked in Hezzie for a skin scraping this Thursday with a new vet. Hopefully, we are able to figure out what's wrong.
The receptionist explained that he would need to scrape the skin until it bleeds?!?! This seems a bit concerning -- but I am sure some medication will be applied to reduce pain.
My hedgie's skin is very flaky and dry -- Should I bring him to the scraping as is? If i give him a bath before hand -- it will be easier to access...
What do you guys think?