Prediabetes Drug-induced prediabetes? Propranolol?

I was wrongly put on propranolol for a year. I say wrongly as it is known to possibly cause hyperglycaemia and I am already diabetic so I with the doctor's approval came off it gradually in the last couple of months.

It has many other side effects too - https://www.drugs.com/sfx/propranolol-side-effects.html

Another useful link - https://www.ncbi.nlm.nih.gov/pubmed/7249936

My Hba1c at the end of August had come down by a point but I wasn't completely off it for another couple of months! I had another Hba1c at the end of November but asked that the result is kept secret until I see the consultant at the end of January. My fasting levels are fairly stable and within range.