If any page from your website can be found in Google's search results you aren't banned. Also, no visitors doesn't mean crawlers aren't visiting your site. Under "Traffic Sources" click on "Search Engines" to see if Google is crawling your pages.
The most likely reason why you don't see any traffic in your Google Analytics report is because you aren't getting any traffic to your website. This makes sense if your pages are no longer being found or ranking well in Google and Google is your number one referrer.
If you search this site and Google you will find this is not uncommon. What you need to do is determine if your site violates Google's terms of service or offers low quality content. If so, you need to correct this. If not, your best bet is to continue to add quality content to your site and wait it out.