PSD crashed and merged into a single Glitch layer

You can try third-party recovery software, but don't get your hopes up. It's extremely rare that a corrupt file can be recovered.

We've all been there. That's why we do incremental saving and backups.

in the future, to find the best place to post your message, use the list here, https://community.adobe.com/

p.s. i don't think the adobe website, and forums in particular, are easy to navigate, so don't spend a lot of time searching that forum list. do your best and we'll move the post (like this one has already been moved) if it helps you get responses.

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