How to fix "*:i386 cannot be configured because *:amd64 is in a different version"?
You should be able to remove packages using dpkg directly, for example:
sudo dpkg -r libqt4-sql-mysql:i386
You can then see if the remaining packages can be configured with
sudo dpkg --configure -a
Once everything's configured successfully, apt-get should be able to install aptitude which should be able to work out a solution to fix the dependencies.