Hi Keith
Oh dear, you are going from situation to situation, but good news with the pps being down again.
Sadly high dose dex can cause diabetes and it is just another thing to add to the list of its awful side effects, but it's working on the pps so it's a balance of risks. You will have to ask if it's permanent, and what can they do to stop diabetes effects, I'm afraid I can't remember, maybe someone else is more familiar with it.
Love Helen