I have non insulin dependent type 2 diabetes. my left foot swells up often and has for years. i injured left ankle years ago too. is this a concern?

Foot swelling: The left foot swelling is a concern. I would discuss checking my vascular system veins especially with my doctor. Is your feeling normal? If not tell him to check the nervous system.

Could be: I would suggest you see a doctor for evaluation of your circulation and for your ankle.

Yep : Swelling to one ankle especially after a previous injury needs an x-ray. Can be many things such as circulatory, chronic injury like tendinitis or subluxation , or possible charcot osteoarthripathy.