Really sorry to read this
@pdoc - let us know how you get on with your scan.
I have just read an article in the BMJ from 2019, where they compared the incidence of type 2 diabetes among patients taking dutasteride, finasteride, and tamsulosin for the treatment of male benign prostatic hyperplasia (BPH). They concluded that men taking either dutasteride or finasteride were at a "modest increased risk of developing type 2 diabetes." I tried to find dosages in the article, but could not see them. I am assuming they are higher than those taking these drugs for hair loss.
The authors speculated (based on other findings) that the increased risk might be due to hormonal changes caused from taking Fin/Dut, particularly, in androgens or glucocorticoids, which could cause androgen deficiency which is linked to insulin resistance. Also, lower levels of testosterone circulating in the blood are linked to type 2 diabetes.
It is worrying. Although I don't take finasteride any longer, I have cycled on and off it over a number of years and there is a history of type 2 diabetes in my family.