When I used my seed before, it wouldn't show me any Bitcoin Cash, it just showed my transactions without any Bitcoin Cash.
Maybe that is because you don't have any bitcoin cash?
I tried to sweep one of my old electrum export addresses into the Electron Cash wallet, but it wouldn't let me to (or allow me to click next)
Maybe the wallet wasn't installed properly. Maybe you've installed electron cash into your electrum folder by mistake?
Forget sweeping! If your Electrum wallet is working and you have all the transactions in there, download fresh electron cash (newest version), install it in a new place, possibly another disk so that you won't overwrite anything. Next, don't input seeds or anything, press open and go into your electrum folder (usually in appdata/roaming/electrum/wallets and choose a wallet. You're going to see your transactions on all the addresses that you have in your electrum wallet. If no BCH appears it means that you don't have any.
And one more thing, check if your wallet is connected to the network. If not, it won't show balances.