If your transactions are not showing up, then you filled in the wrong seed phrase.
Check the addresses in the address tab (you may need to use "view -> show addresses") if the addresses are different there from your old wallet, then you've definitely got the wrong seed.
Was this originally a seed from another wallet? Did you extend the seed with extra words? Have you got another wallet file that this seed actually belongs to and the wallet you lost had a completely different seed? I've seen a couple of users who have got confused when they have multiple wallets created in Electrum.
This is why it's a good idea to make sure you can restore a wallet using the seed BEFORE you need to and find you've written it down wrong or are restoring the wrong wallet...