Pretty sure my milk is drying up..

Help!!!! I take fenugreek (2 pills 3X/day) every day as well as a prenatal still. I'll also drink a dark beer every other day. I don't pump because for some reason it HUUUUURTS. I strictly breast feed but the past few days I've been having to supplement with a bottle here and there because my son (9 weeks Saturday) is acting like he isn't getting enough to eat. This is my second boy. With my first my milk dried up suddenly at 5 months.....we're only at 2 months!!!! Any ideas to help up my milk and keep it going longer?? Thanks so much!!!!!