What Causes Sudden Dizziness And Spotty Vision When Diagnosed To Be Pre-diabetic?

Hello! So this morning I ate breakfast, eggs a banana and some juice and I was feeling fine. A few hours later up until now I have been very dizzy with spotty vision. I am anemic and doctors in the past think I am pre-diabetic. I ate lunch though, hooping it would help the dizziness, but it is still bad. This isn t the first time this has happened to me, it occurs a lot. Do you have any idea about what might be going on? Thanks- Katie.