I realise it is a couple of months since your post but if you haven't already taken up the offer of flu and pneumo jabs I would certainly do so, although the flu jab probably won't be available for this coming season until October or so.
You don't want to get flu - which is quite different from the cold - and you most certainly don't want to get pneumonia, as both can be killers for everyone and particularly so for diabetics.
I had both injections last year at the six-monthly apointment after diagnosis, and while I didn't feel the injections (although there was a small sensation from the pneumo one) my arm was a bit sore for a couple of days from the pneumo jab. There was absolutely no reaction from the flu jab.
Despite that I would rather have a couple of days of mild discomfort than catch pneumonia, as that can lay you out for weeks. I'm glad it is a one-off, but if I needed to have a booster in five or ten years would certainly do so. And I'll be making an appointment in a few weeks when the flu jab becomes available, as that is an annual must for me.