Namaste,
Some questions:
1. Has the 'mail' permanently deleted from your account?
2. Did you double check your 'Trash'/bin?
Of course, you might have already tried those.
There are some things - I want to try. We can 'Try' to recover the mail. It is not entirely impossible.
I am available virtually, we can do screencast through - 'Zoom'. So, in that way - your privacy won't be compromised and also you can actually see the procedure. If in future something like this happen again, you can recover them back.
Kindly message me back - so we can discuss this further on.
Also, I am available on Whatsapp, Slack and Skype. If want we can go through the details there on.
Thanks.