Fenugreek capsules were great for me when my supply dipped with DS1. I usually had lots, even an oversupply, but when it went down a bit the capsules helped. I took more than the recommended amount though.
Definitely seek help from a lac. consultant. I had nip / latch problems with my first, but the LC helped so much. After a couple months, I started pumping a ton because I had so much milk. Also, anytime LO went through a growth spurt I would take Fenugreek to help out since I worked full time. Good luck, mama!