Don't give up! One of the very frustrating things about a change in regime is that the benefits take a much longer time to kick in for your eyes than any other part of your body, and often your eyes can become worse before getting better. This is quite normal, although difficult to explain in diagnostic terms. The dip can manifest itself over many months before improving. You're being tested by your body, but hang in there!
I've had stacks of laser over the years, but my vision is actually better now than it was before. I'm not being blasé about laser - it's serious and not a "treatment" as such, only shoring up existing damage - but it's quite possible to get through it and you need to maintain good blood numbers to get the real benefit. I can still read the penultimate line on an optician's board which is WAY better than a lot of people who still drive!
Keep tabs on your blood pressure too, it is vital to keep this in check in parallel with your blood sugar, especially with ANY diagnosis of retinopathy, whatever stage it's at.