Alot of my addons are missing

On Friday 3/21/14 I got onto Garry’s Mod and went to addons, everyday I play i make sure the ones I’m using are enabled. I looked at the addons list and I nearly freaked, a VERY VERY large amount of addons are just, gone… No where to be seen, when I went to re-download them, it said they were already there, I Quit and went back on like 5 times but still nothing… then i downloaded some new addons and then my Gmod crashed and when i went back on, they weren’t there… but workshop said they were downloaded, please help!

I have none of those addons… and they were working PERFECT before today…

Read the damn thread. It is happening to everyone due to Steam problems.