BF moms: Should I stop breastfeeding?

Dear BF moms, my daughter is 15 months old and lately I haven't been eating enough calories like I used in the first year while nursing. For the past couple of months, due to other pressures, I wasn't keeping up with my diet or maintaining enough calorie intake and I started to feel very tired, started losing weight(which I don't like as I am usually quite lean). WHO recommends BFing upto 2 years which my family followed and I want to atleast as night feeding but feel terribly fatigued with lack of energy or good high calorie diet. should i stop breastfeeding?