I can understand why the letter worried you. I'm kind of in a similar place, I found out I have retinopathy two weeks ago but mine is proliferative and I had an urgent referral for treatment. Try not to stress, there are treatments available and it may be you don't even need treatment yet.
Getting better control is a good move to try and stop it progressing. Although suddenly getting tight control when it hasn't been great can actually make retinopathy worse so try to bring your bgs down slowly. The main thing is to try and prevent spikes and fluctuations as much as possible.
My last hba1c was similar to yours is at 8.4. I also really want to try a pump, mainly due to excessive injecting to get ok control (10 injections most days) and also gastroparesis.
Could you ask your dsn if your hospital run a libre trial? I did this and it really helped with my bg control and seeing where I was spiking. Could see I was spiking between 5 and 8am so increased my basal by a unit which really helped.
I love the libre! I would even buy a sensor if needed.
@catapillar makes some great points. Worth reading think like a pancreas too if you haven't already. Good luck.
S