Oh gosh, @cranky_granny - I am so sorry your level of pain & discomfort has increased ...is there anything you can take to mitigate it?
Be very careful re the dizziness - you sure don't want a fall at this point in time xx
Is there any way your office can send you the documents you need for the BAS's - so you can work at home? I would imagine driving to work will be very painful. :( Sitting on an office chair wouldn't help your sacrum area either! :(
take care, ask your Onc about pain management (cos what you're already on may not cover it fully.)
take care - our thoughts are with you xx