Green poop in 5 month old?

I cant seem to get my foremilk/hindmilk imbalance under control I began block feeding in 4 hour intervals but it doesnt seem to be working...I dont have an oversupply issue, when I pump i only pump out at most in the morning 3 ounces from left and 2 from right, and if I pump after LO falls asleep I only get about 1 1/2 oz. all together, so I dont understand whats goin on. I know for sure the green poop isnt a food allergy cause I dont consume dairy products and I havent changed anything from my diet since he's been born, also he's still not on solids...I wanted to continue nursing after 6 months but If I cant get this under control I may consider stopping. Im so sad! He's always had yellow or mustard mucousy poop but now its green mucousy poop and sometimes it has a small tinge of blood in it. When I pump the milk is always very thin and watery so the sensitivity must be from the lactose overload he's receiving from my milk. Any suggestions?