The GP can arrange for tests for PN and we can't say for sure that this is it and it could be nothing to do with diabetes and the fact that you've always had this weakness suggest this.
The damage to my eyes occurred at 20 years of diabetes and after pregnancy roller coaster sugars! As I understand it prior to diagnosis type 2s have had higher sugars and insulin for 15 years prior so it is plausible that although you're getting your hba1c s much better, that some damage has occurred.