Google Sitemaps Change - site disappeared!

Could this cause a site to disappear in SERPS?

[besnette]

Hello,
I have a well established site, high traffic site, where 60% of my traffic comes from G. Two days ago, I started using G's sitemaps. I made the choice in the console to associate the site with [site...] instead of [site...]

Today, my site has basically vanished from G's results. Frightenting. My site isn't spammy, or a link farm or anything like that, and the site has unique content.

I still see that site: shows my pages, and they don't show supplemental.

So a little freaked out here, and I am wondering if making this change in sitemaps could cause a (hopefully) temporary loss in traffic?

Thanks for any insight!