Hello Matt, welcome to HCM.
Green stools for more than 2-3 days needs medical intervention. If you are on iron supplements
or have consumed a lot of green leafy vegetables, there might be possibilities of green stools. Also, bile juice can also be a reason but the condition needs treatment then. Try consuming mild foods such as brown bread, wheat flakes, eggs etc and check for the color. If it still persists, kindly visit a doctor as you are also diabetic.