. >> christine davidson: i'm so tired. >> logan: 45-year-old christine davidson is one of those people's been struggling with an undiagnosed condition for more than half her life. >> davidson: i kind of feel like my muscles are just torturing me. yeah, my spasm in my hip squeezes so hard, it just pops my... my bones. >> logan: they are torturing you. >> davidson: yeah. >> logan: whatever is wrong with christine has left her unable to walk and gradually taken over her body. >> davidson: i have, like, frozen shoulder syn... like, i can't really lift my arm. and i have restrictive lung disease, where the muscles are tightening so much, i only breathe, like, 50% of what a normal person would breathe. >> logan: after years of shuttling from one specialist to another, she traveled across the country from her home near seattle to see dr. gahl. >> davidson: i'm just getting to the point where i'm really at my last leg. so this chance to come here to be evaluated was really a big deal for me. >> logan: four years ago, when dr. gahl created this program to help people like christine, there was n