Hi Zara,
Just to help ease your mind: I was on the pill for 10 years (no breaks) and went off it in Sept. last year. I didn't get a period for 65 days and through that time I went through phases of dizziness, exhaustion, depression, anxiety, acne breakouts, until I finally forced my doctor to give me a blood test, then got my period a couple of days later. He said all these symptoms were "normal" as your body has to learn to regulate it's hormones on it's own again. My next cycle was 45 days long and I've had about 4 regular length 31 day cycles.
I'm not sure about the diabetes but it is definitely normal to have weird things happening while your pituitary gland (the gland in your brain which regulates hormones) starts functioning on it's own again.
It wasn't until I had a glass of wine and started to relax a bit that my period arrived and things started to settle down.
I hope this helps a bit!