I was using my different email accounts for a long time and were working fine. I check my emails on regular basis and one day strange thing happened to me.

Two weeks ago I deactivate my one email account with which I attached my second email as alias or backup purpose. At the time of deactivation it ask me to remove the attached email which I did and then close the 1st account.
After that I log in to my Second email which I did not change or alter any rules and see an ERASED inbox which is annoying. Why this happened and how can I get back my all important emails.
This is very urgent!

At this situation I was using Firefox 22, Win7 64 bit