Breastfeeding: about to call it quits

Things have beenso tough I don't knife what to do at this point, to start out my supply wasn't the best. My pediatrician had Me supplementing from the beginning since LO wasn't gaining quick enough. I felt so bad a started doing all kinds of things. pumping, oatmeal, lactation cookies, fenugreek, brewers yeast, drinking more water, drinking a beer. Some things would help a little or not at all. LO is 10 weeks now and has almost completely lost interest, she just wants formula and most of the time won't even latch. I'm feeling so terrible at this point, is it too late for me? Is there something I haven't tried?