It's not a matter of panic to forget about your EtherWallet password as you have your private keys and Json key. It would be possible for you to transfer and withdraw your coins with the key you have. But I will suggest you contact MyetherWallet support center and try to recover your password ASAP as it will make your account safer. You will not lose control over it. you may also transfer your most of the balance if you can't make it.