Hi
I agree with claire unless you had high sugars before you may get hypo symptoms, but i think as you have had a racing heart beat call your out of hours doctor, you can get the number off your own GP phone number.
Are you on any other meds, that you have recently been prescribed , if so look at the side effects of them.
This is only by my own experience recently, i am not a doctor.
Hope all goes well and keep in touch just to let us know if you are ok.
Take care
Tracey