Hi Paul! I was on steroids for a while due to IVF treatment - it was a fairly low dose at 20mg/day though. I was advised by my DSN to increase my basals by 40%. It wasn't good enough. Over a couple of days where I carefully monitored my sugars I increased all basals by between 60-70%. I increased my bolus too but I'm afraid I can't really tell by how much - it was a bit but probably not 60%.
I hope this helps a bit and I am glad it wasn't a stroke you had!