I was diagnosed diabetic 10 years ago with a numbness in one thigh which the Dr considered indicated diabetes - which was confirmed. It wasn't giving me problems but I knew it wasn't normal.
That right thigh is the area where any problems occur. Simvastatin resulted in intense pain, particularly overnight. That went away when I discontinued it.
I was on diet, supplemented with metformin, but the diet was the NHS/DUK recommendation of high complex carbs. Early in 2008, muscle pains threatened to be disabling. Dr was happy with my diabetes control. (HbA1c=6.7, overnight fasting BS=6.9) He suggested quinine for cramp. Quinine is the active ingredient in tonic water. It didn't help, but through this forum I learnt the reduced carb approach. The muscle pains cleared within 3 months. (Overnight BS=5.7)
I also take a multivitamin supplement, glucosamine/condroitin, & fish oil. A month ago I ran out of glucosamine. After 2 weeks I had lower leg pain & was walking with a stick & stopped playing tennis. A week of glucosamine/condroitin & I'm fit again.
I haven't tried the "cocktail" approach cited. It does seem that you can take control of problems by trial & error, and very specifically cutting carbs & working to reduce blood sugars.
Hope that helps & you feel better soon.