I think multibit has an option to reset the blockchain, or repair the wallet or similar, to rescan the transactions. This may help you. Or maybe your transactions confirmed in the mean time.
No, just moved to another PC, and did a restore. Not, a new wallet / seed.
Note that you should never enter the seed words on your PC in the correct order, unless you lost your Trezor. You risk that some hacker has a keylogger on your computer and has now the private key.
If you just want to move to another PC, multibit should only ask you for pin and maybe for a passphrase when you restore the wallet. In that case you are safe.