Thanks, everyone. Short story:
I had two flights to get on to go from Texas to Boston. I made sure not to sleep the night before so I could fall asleep on the plane -- of course, that didn't work! I usually can't sleep on planes, so it's nothing new, but it would've been nice. I freaked out a little bit before getting on the first plane, but I wasn't too worried. The flight was only around 40 minutes long, so I wasn't thinking about dying the whole time, just how many minutes before I could get off the plane.
The layover and the second flight though? I had a complete panic attack before getting on the second plane. My brain shut down and I couldn't move or anything. I considered booking a train ride for that afternoon for like $400 to get out of it. The flight was three hours, and I really didn't want to get on that plane. I almost didn't -- I was the last one on that plane afaik. Lucario had to talk to me to calm me down, I really thought I was going to die. The beginning of the flight was hell, but I mellowed out a bit. Still made it back alive!
I'm never getting on a plane again when traveling throughout the U.S.. If I get on a plane again, I'm going to be drugged. I can't deal with the anxiety. I'm so happy to be back on the ground.