Can being on the Atkins diet cause diabetes?

I've been on Atkins on and off now for close to 3 years, I've had a lot of success with it. However the past few months, I've been having weird symptoms, constant spotting, frequent thirst and urination, problems with my eyes (went and had my contacts changed), I've noticed when I eat anything to sweet I get headaches and feel really irritable. However I maintain a healthy lifestyle I'm physically fit, I exercise eat lots of good veggies and fruit. I only ask because I have no health insurance and can't afford to go to the doctor. Please someone give me some good advice.