Thanks everyone. I ended up ringing the neuro this morning to get in to see him because it is day 6 and zero relief, and feels as though I have been lifting weights for days on end.

My reflexes on that side are now even brisker than they were last time I saw him so neuro wants me to get the MRI done urgently in the next few days rather than waiting the 6 weeks I have left til the scheduled one.

Looks like I'll at least have some answers (or be incredibly frustrated if I don't) next week…..