It seems like my Debian disappeared.
 

I've been using Debian GNU/Linux Stable as my primary distro for years. Recently I gave Fedeora's Live CD of the Trinity Desktop a spin and liked it decided to install it alongside my Debian.

From the live CD i chose install, and chose the option to use free space in current harddrive for install (as opposed to custom or replacing current system options).

I kept everythign at default and got a few notices about how data may be lost etc.

AFter install, I removed the CD and booted up and GRUB only gave me an option for Fedora.

Did the "install in free space" eat my Debain partions altogether? Did GRUB over-react my previous Debian GRUB so they are competing and not seeing eachtoher?

I don't think I'm seeing my whole hard disk, as Konqueror says I only have 19 GB total, and I'm fairly certain that's not right. Any help appreciated, I wouldn't have wanted to loose a couple years of tweaking my Debian sytem.

Check if Fedora has OSprober and if it does make sure it is installed. Then update grub and it should show your Debian install as a boot option. If it doesn't than I would go through your file system in the file browser and it might, Gnome does, show other partitions that are available for mounting.

What do you mean by "free space" on your drive? You had unpartitioned space or you are referring to free space on an existing partition? The latter is bad because it probably means repartitioning the hdd in an unpredictable manner which indeed could lead to data loss.
DO NOT ignore warnings relating to data losss.
If you still have the old partition, in theory grub should detect it. In Debian at least, the command is "update-grub" (as root of course).

PS Just an advice: if you have previous data/OS on your drive, NEVER use automated options for installing an OS (ANY OS).
If you dont know how, learn before making such changes.