It's not a done deal, yet. We've all probably been in the same boat you're in now and I've shed my own tears, but let's see if we can get you back up and running.
Your site isn't gone, it's just that when you deleted what you had cut and pasted in you probably deleted something extra - it could be as little as a semicolon - and it's giving you an error. Think of it as a locked door, but the house is still behind the door. Basically, the easiest thing to do is to reinstall your theme which will set everything back the way it was. Then you'll be able to see you're content again
1. Download the theme again http://wordpress.org/extend/themes/blogolife and unzip the files onto your computer.
1. FTP into your site's files - your webhost will have instructions how to do that so look it up on their support pages if you don't know how. Often they'll have a web based FTP program you can use but if not they'll should suggest some (depends on what OS you're using)
2. Once you're connected via FTP you'll see all the files that make up WordPress. Find the folder "wp-content" and then the folder "themes"
3. Replace the "blogolife" folder with the one you just downloaded and unzipped (it will probably ask if you want to replace the folder and you do).
If all that has worked, you should be able to access your site again. When that's done, drink a large glass of the beverage of your choice and feel your heart return to a normal pace, then we'll deal with the menu again, if you're up to it.