Sounds like a very unpleasant experience!
If you had continuous recording turned on, the videos should be in the /record folder.
There should be sub-folders for each day and for each hour. The videos will be one minute long MP4 files within each hour folder.
None of these are hidden files. The one minute clips can easily be combined using a free tool like this one - MP4Tools - Home
I believe that the still pictures are thumbnails for the 12sec event videos stored in the Wyze cloud.
I hope you get it resolved!
/Edit
A lot of people are having a similar issue here: