I think the pain you are experiencing might be due to pelvic infection
,get a check up done from a gynaecologist to rule out pelvic infection,even though you are hysterectomised, as being diabetic you are more prone to urinary tract
and reproductive tract infection
Other thing might be due to osteoporosis
and weak back bones giving you back ache,so increase milk intake and start taking calcium daily and vitamin D once a week which might help you.
Keep your sugars under control.
Don't worry, every thing would be fine.
Dr. Om lakhani