Sent email disappeared, heard 'sent' whoosh, but it's not in the Sent file Wrote email, sent it off, heard whoosh sound, assumed it was done. 

Not so.

Cannot find the email anywhere, least of all where it should be: in the Sent File.

Tried various setting options - advanced to tick off the 'sent' option on iPad (nothing) and cannot get it to go to the web server where it was in the first place, but then somehow switched.

I just want to see what I sent, that's all. Please help - I've tried everything I could think of.
Login to your email provider and see if the email is visible there
    (ex: gmail.com if a gmail account).