Your site doesn't show at all. I know you aren't convinced that it's theme related, but it sure looks like it could be a theme issue first, then possibly other issues beyond that. The first thing to do is get the site to display again.
1) This message: Parse error: syntax error, unexpected '<' in /home/content/71/9048071/html/critnick/wp-content/themes/headway/header.php on line 10 means you probably really could have an issue with a bad edit or a mistake in the header.php file in the headway theme.
The easiest and quickest thing to try, might be to first make sure you have a complete backup copy of your sites files and database, then replace just the header.php file in the headway theme with a new copy of the file taken from your original backup copy of the downloaded theme.
2) If that fails, you could also try using your ftp client or the file manager in your hosts control panel to rename or remove the headway theme directory. After you do that, revisit your site at critnick.com/wp-admin, and the default WordPress theme should take over once you log back in.
That might be the extent of my suggestions of things to try at this point. If I'm not mistaken, Headway is a commercial theme. Once you get your site back up you might want to check on their support forums and see if there has been any conversation about compatibility, or any issues similar to yours.
 the reason I really think it may still be a theme issue is because this still works with no error message; critnick.com/wp-admin