Stuart
I'm sorry to hear that. Definitely speak to your oncologist to see if he could maybe prescribe it for you or he might have another solution That's really frustrating. I had some intermittent bleeding on my tongue initially, which had stopped prior to being given the Betamethasone.
I would really express how it's getting you down on top of what you're already dealing with and wouldn't it be worth trying?! One thing I have learnt since my diagnosis last year is that you have to be pushy.
I'm sorry I can't offer any further advice because I know how uncomfortable it is. I hope the rest of your treatment is still going well!
Best
Seb