My Fedora Setup is gone due to accidental "yum upgrade"

Question

How to roll back? I tried yum history undo 143 and yum --skip-broken history undo 143 and get the following errors.

Important: All I care about is getting my kernel and custom graphics driver back to how it was -- the default kernel doesn't boot and my eyes hurt from the laptop monitor whose brightness can't be adjusted with the Fn keys at least.

The rest of the packages can stay or leave as they please it doesn't matter. So if any low-hanging fruit I can grab, it would be nice:

Skip-broken could not solve problems
Error: Package: nautilus-extensions-3.6.3-4.fc18.x86_64 (@updates)
           Requires: nautilus = 3.6.3-4.fc18
           Removing: nautilus-3.6.3-4.fc18.x86_64 (@updates)
               nautilus = 3.6.3-4.fc18
           Downgraded By: nautilus-3.6.3-3.fc18.x86_64 (fedora)
               nautilus = 3.6.3-3.fc18
Error: Package: 2:qemu-kvm-1.2.2-14.fc18.x86_64 (@updates)
           Requires: qemu-system-x86 = 2:1.2.2-14.fc18
           Removing: 2:qemu-system-x86-1.2.2-14.fc18.x86_64 (@updates)
               qemu-system-x86 = 2:1.2.2-14.fc18
           Downgraded By: 2:qemu-system-x86-1.2.0-23.fc18.x86_64 (fedora)
               qemu-system-x86 = 2:1.2.0-23.fc18
Error: Package: 12:dhclient-4.2.5-15.fc18.x86_64 (@updates)
           Requires: dhcp-common = 12:4.2.5-15.fc18
           Removing: 12:dhcp-common-4.2.5-15.fc18.x86_64 (@updates)
               dhcp-common = 12:4.2.5-15.fc18
           Downgraded By: 12:dhcp-common-4.2.4-23.P2.fc18.x86_64 (fedora)
               dhcp-common = 12:4.2.4-23.P2.fc18
Error: Package: libreport-2.1.7-1.fc18.x86_64 (@updates)
           Requires: libreport-python = 2.1.7-1.fc18
           Removing: libreport-python-2.1.7-1.fc18.x86_64 (@updates)
               libreport-python = 2.1.7-1.fc18
           Downgraded By: libreport-python-2.0.19-3.fc18.x86_64 (fedora)
               libreport-python = 2.0.19-3.fc18
Error: Package: openldap-2.4.35-4.fc18.1.x86_64 (@updates)
           Requires: nss-tools
           Removing: nss-tools-3.15.2-1.fc18.x86_64 (@updates)
               nss-tools = 3.15.2-1.fc18
           Downgraded By: nss-tools-3.14-7.fc18.x86_64 (fedora)
               nss-tools = 3.14-7.fc18
** Found 6 pre-existing rpmdb problem(s), 'yum check' output follows:
1:numpy-f2py-1.7.1-1.fc18.x86_64 has missing requires of numpy = ('1', '1.7.1', '1.fc18')
python-matplotlib-1.2.0-14.fc18.x86_64 has missing requires of numpy
python-numexpr-2.0.1-2.fc18.x86_64 has missing requires of numpy >= ('0', '1.6', None)
python-pandas-0.10.0-1.fc18.x86_64 has missing requires of numpy
python-tables-2.4.0-1.fc18.x86_64 has missing requires of numpy >= ('0', '1.4.1', None)
scipy-0.12.1-1.fc18.x86_64 has missing requires of numpy

yum --skip-broken history rollback 142 output is slightly different:

Skip-broken could not solve problems
Error: Package: nautilus-extensions-3.6.3-4.fc18.x86_64 (@updates)
           Requires: nautilus = 3.6.3-4.fc18
           Removing: nautilus-3.6.3-4.fc18.x86_64 (@updates)
               nautilus = 3.6.3-4.fc18
           Downgraded By: nautilus-3.6.3-3.fc18.x86_64 (fedora)
               nautilus = 3.6.3-3.fc18
Error: Package: 2:qemu-kvm-1.2.2-14.fc18.x86_64 (@updates)
           Requires: qemu-system-x86 = 2:1.2.2-14.fc18
           Removing: 2:qemu-system-x86-1.2.2-14.fc18.x86_64 (@updates)
               qemu-system-x86 = 2:1.2.2-14.fc18
           Downgraded By: 2:qemu-system-x86-1.2.0-23.fc18.x86_64 (fedora)
               qemu-system-x86 = 2:1.2.0-23.fc18
Error: Package: 12:dhclient-4.2.5-15.fc18.x86_64 (@updates)
           Requires: dhcp-common = 12:4.2.5-15.fc18
           Removing: 12:dhcp-common-4.2.5-15.fc18.x86_64 (@updates)
               dhcp-common = 12:4.2.5-15.fc18
           Downgraded By: 12:dhcp-common-4.2.4-23.P2.fc18.x86_64 (fedora)
               dhcp-common = 12:4.2.4-23.P2.fc18
** Found 6 pre-existing rpmdb problem(s), 'yum check' output follows:
1:numpy-f2py-1.7.1-1.fc18.x86_64 has missing requires of numpy = ('1', '1.7.1', '1.fc18')
python-matplotlib-1.2.0-14.fc18.x86_64 has missing requires of numpy
python-numexpr-2.0.1-2.fc18.x86_64 has missing requires of numpy >= ('0', '1.6', None)
python-pandas-0.10.0-1.fc18.x86_64 has missing requires of numpy
python-tables-2.4.0-1.fc18.x86_64 has missing requires of numpy >= ('0', '1.4.1', None)
scipy-0.12.1-1.fc18.x86_64 has missing requires of numpy
[root@y500-fedora