Hi, your borderline diabetes is not necessarily the cause of pe, becos pe is a natural tendency for millions of men it can be overcome through a combination of medicines and specific techniques (not just breathing exercises or pelvic muscle exercises.)
itching is most likely due to yeast infection called candidiasis, which occurs in diabetes. It can also occur for othr reasons in women, such as progesterone elevation, contraceptive use etc.
For further guidance, please consult over phone.