OK so let's start. You didn't make mead. Mead is made with honey, not sugar. What you made is a very crude alcohol usually only fit for distilling. It will have no taste, no body and no mouthfeel.
Secondly, you probably did not follow any sanitary protocols, so chances are that solution you pitched the yeast in was not clean - at all. That means there's probably an infection in there, which would explain the smell.
Thirdly, it may be safe to drink, but I would not. It will taste like it smells, which won't be good at all. I would toss it away.
Lastly, to mimic one of our local "experts", I would recommend you listen to the GotMead Podcasts with Ryan Carlson. They can be found here:
http://gotmead.com/blog/gotmead-live-radio-show/page/3 These podcasts will guide you through the process of making proper mead.
In short, you did absoluteley nothing right, and that's fine, since it's your first attempt. Don't make that mistake again - do proper research and homework and you'll soon make VERY good meads in very short periods.