So I've been getting uncontrollable highs after food for the past 10 days or so, numbers like 12, 10, 14 etc and it takes ages for them to come down into range and as soon as as I eat BANG it's up again. Been using the same NovoRapid pen for a couple of weeks and it's been fine, do you guys think then pen may have gone off all of a sudden? Should I change it and and see, it's really PISSING me off to be honest. Any ideas what might be causing this?