Thanks, everyone!
Yes, you can transfer after an expulsion. I have worked with hundreds of students in this situation, and it is more or less my story, too. My mental health meltdown happened in high school rather than college, and my holistic private high school chose not to formally kick me out, but I did not graduate. I lived to tell the tale and even graduate from Harvard twice. The important thing is to LIVE the recovery, and then you can TELL the recovery story to colleges.
Achieving and maintaining the recovery is the hard part here. If you can do that, the college part is comparatively easy.
If you’d like some professional help on this, PM me. Good luck!