Hi -- it's probably not linked directly to diabetes, I do hope they can sort out a diagnosis fast.
Do make sure that they are testing you for B12 deficiency, among other things, given that you already have auto-immune problems. Jerky legs, pain in legs and lower back, weakness are all symptoms of B12 deficiency (as well as other conditions). B12 deficiency mimics more serious neurological conditions, but can be treated very easily and safely, though consultants often forget to check.
Keeping fingers crossed for you.....