Feel sorry for ya man.
What you can do the next time is :
-download Mega V1 and /or V2 from the Playstore. Put camera upload on, you can even give tasks what to upload and what not. ( cloud, also flickr, dropbox, box, drive, onedrive has options, i prefer Mega)
-Make back up data with smart switch on pc.
Your games saved data are most of the time saved on google play games service.
I have seen topics about the selfreset.
Maybe better to use the OEM charger only.
I had a problem with a powerbank. I used the cable that came with the powerbank and my S6 was slow, lagging ( even worser than putting the phone in battery save modus) while the phone was charging. I removed the cable from the phone and it was normal.
I placed my S6 cable and it was solved.
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