He said it was reactive Hypoglycaemia, which is low blood sugar a few hours after eating or during exercise, this is why I want to know what the chance is of it turning into diabetes, my doctor is vague on the subject and says it depends on all kinds off things.
This doesn't make sense. If you have low blood sugar, you are a diabetic - hypoglycemic. Did you ask your doctor why he/she feels you have low glucose when your tests say otherwise? For a doctor to come to such a conclusion there must be something going on that's not being disclosed . Call him/her if for clarification.
I have been tested by a doctor recently, they did a full blood test this is how I know I dont have diabetes, he is also the one who told me my blood sugar was low.
"when I exercise I get low blood sugar,
How did you arrive at this conclusions? By the symptoms you described? Testing? A doctor? It would help to know how you determined this.
"I don't have diabetes".
By the symptoms you described it's possible that you may be diabetic Have you been checked by a doctor lately?
"chance of developing it"
Without knowledge of your medical history that would be hard to determine.