Upload speed decreased dramatically

I'm just curious if you guys have any ideas.

I pay for and I'm used to getting 20 mbps up. Right now I'm getting 1.5 on average, sometimes as low as 1. I'm monitoring my own LAN with a program called Net Meter. Download speeds are still great!

This started the other day when I was streaming on Twitch. Everything was fine, then the stream disconnected. Once I restarted the stream, the upload data was super slow.

Cox says everything looks fine on their end, but here's a screenshot of my speed test I did: http://speedof.me/show.php?img=140524143438-38859.png

I've tried three separate Windows PCs, my phone, and my iPad. I tried two different modems. I tried with and without my router. I've tried different ethernet cables. I've tried uploading files via YouTube, Google Drive, Skype, DropBox, and a few FTP sites. I even tried Cox's own webmail. I'm lucky to get higher than 1 mbps.

I would suspect the cable line, but Cox's own speed test tool on their website works just fine. I get 120 mbps down and 20 mbps up, AND I actually see the results on my LAN using the Net Meter!

I'm really at a loss here. None of my friends have this issue. Cox will be sending out a tech on Tuesday, so hopefully it works out. But I'm pretty confident it's not on my end. Some friends at work think it's an internal routing issue. Has anyone experienced something like this before? Thanks for any advice you guys might have.