You have received a ton of great info. on this topic thus far, I just wanted to share our experience with eating issues:
Sorry if this is way off base, but DD also had eating issues when she was young. By age 18 months , she was diagnosed with both infantile aneroxia, bulimia, and major sensory issues (she would flap her hands very quickly anytime anything was in her mouth) .
She was classed as failure to thrive and was hospitalized a lot due to dehydration (from not eating and from sticking her fingers down her throat and making herself vomit daily ).
It was a very scary time and the doctor finally said either a feeding tube since she simply wasn't thriving or medication to make her hungry.
We opted for medication (cyprohedtadine, 4 mg). The doctor wanted her on it for min 3 months. After one month she had GAINED 3-4 pounds and there was a major INCREASE in appetite and huge decrease in eating issues/sensory issues. We opted to stop the meds after one months since there was such an improvement.
For us, it was like a miracle.
DD is now 8 and has no eating issues whatsoever. The only foods she still can't tolerate are what she calls "mixed up foods" (stew, spaghetti sauce, Chinese food etc)
I don't know if this would medication would help or not, but for us it changed everything in our life. She was also classed as having so many other issues, but as soon as she started finally eating, the other issues lessened considerably as well.