Scooped and left alone by PhD advisors. What are my options?
Non-responsive/bad advisors seem to be the rule rather than the exception in acadamia.

Switching programs will probably only result in switching to other bad advisors and cost you enormous amounts of time for little effect on the results. Dropping out because a handful of people aren't as helpful as they once were would be foolish as well.

Finish your PhD and move on.

Lastly: Keep working with mental health professionals. You said you're depressed and seeking treatment. I'm glad you're getting that medical condition checked out. Sometimes that treatment can take time to take effect and get some relief from it. You might also want to interview some other professionals to see if they might have a better diagnosis or treatment plan for you.