Hi
@Rog , I'll give you James' story as far as the vision thing goes. Just over a couple of years ago he felt there was something going wrong with his vision - going blurred. An optician looked in his eyes, saw problems and told him he probably had diabetes and MUST do something about it. One blood test later (24mmol/l) and he had a very clear diagnosis. The doctor handed over a prescription for Metformin and a diet sheet advising regular consumption of carbohydrates.
While I had little clear knowledge of diabetes at the time, I knew what you ate had something to do with it. I also knew that the doctor's diet sheet (5 a day, lots of healthy whole grains, avoid saturated fats etc) was exactly what we had been eating for the past quarter century and it didn't appear to have done much good. I got my brain into gear and we, almost immediately, adopted Low Carb. (High Fat took a little longer).
As James's sugar levels dropped back to normal, (about nine days), his vision became more blurry. This, I think, is something to do with the optical qualities of the fluid in the eyes and the eye shape has to adjust to changing circumstances. He stopped driving for a few weeks and also stopped wearing his glasses - better without them. Then everything cleared. In due course he got new glasses and now his vision is very good. (He has worn glasses since childhood).
The above message is, "sit it out" and don't buy new glasses (if needed at all) until your eyes have settled.
However, there is another aspect to the story. Because of long held high sugar levels, he did have background retinopathy on diagnosis. Many will tell you that
sudden drops in sugar levels make this go worse and this was my husband's initial experience, leading to laser treatment. A slow drop is said to be best. BUT the important thing is to get the sugar levels down. My understanding, and our experience, is that , yes, it does get worse before it gets better and, for those who do get their sugar levels right down and keep them there, the longer term prognosis is much, much better. James has had no further treatment, and the retinopathy has now regressed. The consultant describes his progress as "phenomenal" and is taking an increasing interest in Low Carb.
I would encourage you to stick with it - for life, but do consider tapering off your carb consumption, rather than complete cold turkey.
Sally