SSD drive problem

Question

SSD drive froze while using a slowing FCP X (thousands of video clips due to time code breaks from downloaded miniDV tape despite Fast Forward/Rewind to tighten tape on spool); Force Quit wouldn't work to resolve the freeze. Had to manually restart. Lost the following: all iTune songs, all video clips and projects in FCP X, all bookmarks in Firefox. Other losses may appear, who knows. DiskUtility used to verify/repair startup and RAID disks and permissions repaired also.  Relevent .plist items trashed. Nothing has worked. User folder not in finder, can get it to with 'Go>' menu. Using Mavericks 10.9.3. Time machine stopped backups because disk is full (it doesn't rewrite old backups). I can see iTunes songs in Finder window with Search>iTunes, but the songs don't display a file pathway at the bottom of the window and when the empty icon is clicked, it says the alias is broken but Fix Alias won't work because the songs can't be found. Get Info on a song says I have unknown permission to the song. 'Macintosh HD' icon doesn't show up on desktop, not do the RAID drives. I can't scroll this page I'm typing in.
Help
SSD drive froze while using a slowing FCP X (thousands of video clips due to time code breaks from downloaded miniDV tape despite Fast Forward/Rewind to tighten tape on spool); Force Quit wouldn't work to resolve the freeze. Had to manually restart. Lost the following: all iTune songs, all video clips and projects in FCP X, all bookmarks in Firefox. Other losses may appear, who knows. DiskUtility used to verify/repair startup and RAID disks and permissions repaired also.  Relevent .plist items trashed. Nothing has worked. User folder not in finder, can get it to with 'Go>' menu. Using Mavericks 10.9.3. Time machine stopped backups because disk is full (it doesn't rewrite old backups). I can see iTunes songs in Finder window with Search>iTunes, but the songs don't display a file pathway at the bottom of the window and when the empty icon is clicked, it says the alias is broken but Fix Alias won't work because the songs can't be found. Get Info on a song says I have unknown permission to the song. 'Macintosh HD' icon doesn't show up on desktop, not do the RAID drives. I can't scroll this page I'm typing in.
Help

Answer 1

I really appreciate your trying to help. Yes, TRIM is and was enabled on the SSD. I tried your Option/Restart suggestion, but that did nothing. I did a reload of the Mavericks OS over the Internet from Apple, but the pathways to iPhoto library, Quicken data, and everything else that is wrong was not fixed by reloading the operating system. Time Machine doesn't work because it's been reset, too. It had stopped working before the crash because the backup was full and Time Machine doesn't write over old files and I haven't bought a new backup disk to use as a new Time Machine. I can find old copies of some files in the Time Machine folder on my backup disks, and I have manually transferred them to their former places, but now I feel like I have two copies of many files, with the old files hidden somewhere. I have no idea where my iPhoto library and settings went, or where my downloads folder contents are. I did not upgrade iPhoto before the crash.
All software is up to date. I have a Mac Pro 5,1 Running OS X 10.9.3
Processors: 2 x 2.66 GHz 6-Core Intel Xeon (12 Cores total)
Memory: 24 GB 1333 MHz DDR3
L1 Cache 256 KB/core
L3 Cache /processor:12 MB
Boot ROM: MPS 1.007F.B03
PCI Cards: ATI Radeon HD 5770
Startup disk: internal  Apple SATA SSD 500 GB, with 238 GB available.  I primarily use this as the residence for my applications.
I have 2 other internal hard drives (the types that spin) that are configured as 2 RAID sectors to hold most of the files I work with.
All disks have been examined by Disk Utility, verified, repaired where needed (not much needed repair), and permissions were repaired. I also deleted relevant .plist items.
It seems to be a fatal pathway problem. Otherwise, the Startup disk 'works'