Hi Mel. I am sorry you're having such a hard time. I don't have great advice like Laurie and Nona, they are the experts around here. I Just wanted to tell you that you don't have to feel guilty about anything. You have done your best to provide the best for your little princess, now that things are getting harder, you don't have to blame yourself.
Try the advice the girls gave you for a while, if they don't work, then know in your heart that you've done ALL you could have possibly done and it did work...YOU DO have 100 oz. of precious mother's milk for your baby girl. Every single ounce was hard to have and those 100 oz. are a treasure and a great gift from you to your loved one.
Hang in there, and do visit and tell us how things are with you.
(hugs)