I hadn't used it for a few weeks, and when I opened it to work,all the actions were gone. i reopened it, no change. No idea how that could even happen, but I lost dozens of actions. And they were not in the PS folders either. Capture One is looking better every day.
Custom actions are only in the Actions folder if you save them there yourself. If your custom actions have disappeared from the Actions panel, then that sounds like you somehow reset Photoshop. In another thread you say you lost your Lightroom catalog, so I wonder if something happened with your computer that you are not telling us.