You could have a misplace vertebrae in your lower back or hip, if so, this can sure cause the problems you have when you stand for a long time.
If you follow through with caregiver222 recommendation and all is OK then follow up with a Neurologist.
The most likely etiology is degeneration of microcirculation secondary to chronic elevated glucose levels. You require a diabetic evaluation to include both an a1hbc and a glucose tolerance evaluation. A single test for sugar is meaningless because at some point in the day a diabetic may have a normal glucose level.