I know that feeling mate because last year I was a victim like you! After then I always told people do not use the Myetherwallet alone. Everyone should use a hardware wallet, you had 45 ETH and one hardware wallet price is only 100 USD almost. You should've bought a hardware wallet. I don't know there is any chance to get back your assets! Now, you have to buy a ledger or Trezor wallet firstly! Have patience mate!