Two things I noticed off the top:
1. You don't have a robots.txt file. Even if you don't want to use REP, you can still help our crawler by placing the path to your sitemap in the robots.txt file.
2. When I tried to view your sitemap file at http://yellowassistance.com/sitemap.xml, I received an access denied/ xml error:
The XML page cannot be displayed
Cannot view XML input using XSL style sheet. Please correct the error and then click the Refresh button, or try again later.
Access is denied.