You can use insert your privatekey or seed in any wallet that supports Bitcoin cash
Electrum cash or coinomi (mobile) are my recommendations.
Calm down, you didn't lose anything. You just sent your Bitcoin cash to an address which you have the keys but no interface to see the funds.
Thanks, but it doesn't work. I've downloaded electrum cash and coinomi but it shows 0 BCH.
Did you insert the Private key or the seed?
If you ha r the seed, you can go to iancoleman.io/bip39 , insert your seed and get the privatekeys qrcode
Coinomi allows you to scan that qrcore and recover the gunfs.
After doing this procedure your seed will be compromised.