Poop question

Lydia

My son is 12 weeks today(5/2120) he is EBF. 1 week ago he started to have green poop (it was always yellow and seedy). I thought it was because i started a cash cow supplement to help my supply and i also ate some spicy food night before. He also started only nursing for 10-15 min on just one breast per feeding. He continued to have green poop so i stopped the supplements friday. For the past 5 days he has had 7-8 various shades of green almost watery poop per day. I read it can be from him not getting enough hindmilk. So i pump the side he ate off last and then give him that milk back in a bottle. I feel like the wost mom ever. I wasnt able to breast feed my other son because i never had enough milk. Now i feel like i am failing again or making my son sick.