Hi all, I managed to get my GUI back.
Actually, the system was indeed running, except that the GUI was not loading properly. So I literally issued the following commands blindly - as if somebody blindfolded me, and it worked!
I am able to do it because I used the terminal enough and remembered the behaviour of Ubuntu!
<my username>
<Enter>
<my user password>
<Enter>
sudo dhclient3 eth0 <-- to activate my LAN internet
<Enter>
sudo apt-get remove --purge nvidia-current nvidia-current-modaliases nvidia-settings
<Enter> <-- wait for a minute for apt-get to remove all traces of NVIDIA
sudo reboot
<Enter>
Hope this helps anyone in my shoes!
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