HELP lost account - Overwatch

So maybe a year ago, I bought Overwatch and played for a few months. I got bored and stopped playing. Around 4 months ago I logged out of my account and borrowed my brothers to play Diablo III. Yesterday, I reopened blizzard to go back onto my main account to play Overwatch with my friends, but when i tried logging in, it said that my account did not exist.
I was wondering if I made my account through facebook, but that just made a new account, which I am currently using. I would like some help in recovering my account because I really dont want to buy Overwatch again.

I am pretty sure my account username is StarSurfer#1912
Please help
-A semi-distressed person