my acc is gone?:(

I just played yesterday my last game and go relog and i couldnt log in back..i tried 100 times on the web and in the game it says password,username dont match ...i dont know what to do i forgot my email password ,i dont know how someone changed my password friend only knewd the password but how can he know the email password needed for changing password??make no sence does riot permabann my acc?WHAT IS HAPPENING so desperate i have this acc since 2014 and i put a lot of time and money into my acc and now its gone away???if someone can pls help me i dont know what to do and i dont think RIOT will help me recover it...i cant belive
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