Breastfeeding 2😫

Okay ladies I need your help! I had a preemie back in January and ended up stopping the breast feeding after he was discharged due to work and stress and bad postpartum. But now I have a second preemie yes another baby 2 in one year😫😍💋🙏🏽 but my first son was 27w6d and did really well until now he is constantly in and out the hospital with lung issues breathing issues and doctors are saying to put him back on breast milk for the immunity from me but I also just had a baby on 10/9/18 and he is in the Nicu now and I’m wondering how do I boost my breast milk production to now feed both my sons ?? I’m a desperate momma and need of serious help!!! Anyone have any ideas??