About to cry!

Really depressed, what am I doing wrong? I had my triplets at 32 weeks a week ago. I've been pumping every 3 hours, eating all the right food, eating lactation cookies, drinking mothers milk tea, even drinking a Guinness with dinner each night (suggested by a NICU nurse). I get almost nothing each time I pump. My nipples are chapped and look like I might be getting thrush. Any suggestions. I'm getting really down.