I've been developing similar foot issues, in addition to arthritis in the right foot (set off by injury, but suspected that my diabetes has facilitated its development).
In addition to Glucosamine & Chondroitnin mix (for the arthritis), I take Omega3, EPO - Evening Primrose Oil and L-Arginine.
Omega3 and EPO improves blood fats and flow, and EPO can apparently help with nerve damage; L-Arginine increases the oxygen levels in your blood and is found in green veggies such as: spinach, brussels, kale, spring greens, cabbage and watercress, etc.
I've been using the supplements as an interim stop-gap measure until I've reached the stage where my new 'diet' has thoroughly embedded itself, but I have noticed an improvement.
I also wriggle my toes and feet when sitting down (such as now as I'm typing this) - excercise helps lubricate the joints, stretch the muscles and ligaments and get the blood flowing better through the affected area.
I strongly suspect it's the combination of better diet and keeping active that is providing the improvement for me, and not solely one or t'other.