My midwife confirmed what I had been thinking all along: some women with horrible morning sickness feel a lot better at lower elevations! She said she has had other clients who had the same experience as me in Oklahoma.
In light of that news, we've decided to go to Texas this weekend for my Grandma's 90th birthday. I am soooo hoping I feel better there. And I have already made a reservation for Emma and I to go back to Oklahoma in a couple weeks. I'll put up with any amount of heat and humidity to feel human again!