sally! you look great. how old are you ?
some things you might try are to either cut coffee and try green tea, or continue coffee but take a zinc supplement(will balance out copper imbalance from coffee, birth control that lead to bad bacterial overgrowth), maybe consider doing half coffee half roasted dandelion to get your potassium up(coffee depletes potassium, low potassium=raised blood pressure)
dulse might be good for you as well, its high potassium, and has natural iodine to help balance blood pressure and fight any infections/disbiosis you may still have from antibiotics.
did you ever take any rounds of probiotics after antibiotics?
do you ever age your meats or make yogurt or fermented veggies?
try to avoid cold pressed oils or any vegetable oils, regardless of quality, instead try more egg yolks or get fattier cuts of meats or make your own butter, this will shift your body composition
also try to add some fish, clams, oysters to diversify minerals, amino acids and fat content.
why not try and make something better then nesquick? you can mix stevia powder with a little cacao powder(should be fermented AND roasted) or even stevia with roasted dandelion roots adds a little bit of chocolate flavor. sometimes if I am being lazy I just get these tea bags from Yogi tea called "mayan cacao spice" and make tea and add a little raw goats milk, its delicious and at the very least its just leaves and twigs and beans flavoring the tea, nothing too chemical or industrialized.
it sounds like you are working out TOO much, and that you are actually already at a low weight., if you loose another 20 pounds you will be underweight for a fertile female, best to rest and work on healing and body composition.