I wanted to let you know, that I totally understand how you feel.
My DD was diagnosed with reflux and put on prevacid at about 3 months old. Up until we put her on prevacid, she would SCREAM every time we fed her. I would be trying to feed her and sobbing at the same time. It was terrible.
My doctor ended up prescribing her Prevacid, and it helped a little, so they increased the dosage, and then it got better. So, if your little girl is still in pain, then maybe it is time for her dosage to increase. A lot of times doctors do this as the child gets older anyway.
As far as suggestions, I don't have many. Maybe you can see if you can feed your daughter a few ounces of formula, then try her solids, then the rest of her formula.
The only other thing I can suggest is that if your daughter likes finger foods better than baby foods, maybe you should try and run with that. I would try some really soft things and just let her have at them. Maybe because being fed has always cause discomfort, she would rather try and feed herself.
I totally understand how you feel. Please know that you are doing a great job, and yes, your daughter will eventually eat!