Lost everything on my account?

Evening All, I've recently installed League again on my New PC after around a Year of not playing. it asked me to change my nickname because of inactivity to allow other players to have the chance of having my name. "dirtymagic" (Original Name) Which i completely understand- So just changed it the dirtymagicUK.... BUT I've noticed I have lost every single bit of progress I made over the years of playing the game? .. No way I could afford to miss out on all the champs and skins I paid for in the past and the event icons I loved that i would never get again!.. Is there away to get it all back as I don't want to start fresh again? surely this isnt a thing?! Thanks, Luke
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