So I was messing about with the Desert Ranger armor last night making it look badass as fuck, when I done fucked up. I loaded the armor .nif with extra NiTriStrips from other armors inserted into Blender. If it makes a difference, one of the extra parts was the Desert Ranger Helmet. I messed about with it for a bit and exported it using these settings:

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and copied the needed parts into the original .nif. So here's where the fuckup starts (As far as I can tell...). I forgot to rename the helmet(I think) from what it got defaulted to when I pasted it in in Nifskope. I believe it was called:'Bip01 L Forearm' or 'Bip01 L Hand'. I saved it and booted up the game. When it opened my character was totally messed up, the armor was stretched all over the place and none of my animations would work. So I closed the game to figure out what was wrong. I found the offending node, fixed it and rebooted. The armor was still fucked. I tried a different save, the armor was still fucked. I closed the game and overwrote the offending .nif with an original backup. I rebooted the game and to my dismay all my left hand animations are broken. Every. Single. One. Through all my saves and all armors. I can't even use my pipboy because the anim is making it face away from my character. The .nif that broke them is no longer being used so I am very worried for what this means. Any help would be appreciated. I have verified my game files and nothing came up short. Do I have to reinstall all my animation mods? Do I have to reinstall the game?! Any tips or tricks would be appreciated, and if anyone's encountered this issue as well I'd appreciate it if you can help me out. Here's some screenshots of the fucked animations:

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Well something as drastic sounding as what you have described you could try reinstalling all animations but you'll probably have to reinstall the entire game for it to work.