Hi,
It could be shin splints but that pain would feel very different from ankle pain. Generally ankle instability would give you pain over the outside of the ankle. I hope you are addressing your foot issues....wear VERY good shoes even if you also have shoe inserts. Also, don't ignore lateral hip strength both because of the previous ankle injuries and the foot pronation.
For more info you can check out this site:
Foot Joint Pain, Symptoms and solutions for foot pain conditions.
Good luck.