Hello Joe
Have you spoken to your parents or guardian about the vision problems? It's possible it could be a symptom of diabetes, but eating lots of sugar for 5 or 6 months is unlikely to lead to diabetes. There's only really one way to know for sure and that's to see a doctor for a blood test, but I'm sure your Mum or Dad would like to know that you're not feeling very well, that way they can help. For teenagers and young adults the symptoms tend to be extreme thirst, needing to wee a lot, feeling very tired, losing weight despite eating lots of food. Wonky vision can be a symptom too but it would usually be in combination with those other things. Like all things it's best to let someone know you're feeling worried, wonky vision can be a symptom of lots of things, including migraines, a need for glasses and sometimes just not eating enough food, but it's always best to check it out just in case 🙂 even though it's most likely nothing to worry about.