If you're not seeing the Revisions module while on the editor screen, click Screen Options (top right corner of your Admin page) http://en.support.wordpress.com/screen-options/ to activate it. Then select the post and page modules to include them. http://en.support.wordpress.com/modules/#list-of-modules Then you ought to be able to go here > Dashboard > All Posts > Posts and locate the post and recover it from post revisions.

If you cannot locate the post for locating and restoring a post revision, and it's not in your Trash folder http://en.support.wordpress.com/trash/ then you will not be able to recover it. http://en.support.wordpress.com/trash/#restoring-from-trash

Did you create your post on the dashboard of your own blog?
Dashboard > Posts > All Posts > Add New

Or did you create your post on the front page of WordPress.com?
http://wordpress.com/#!/post/

How do I avoid this problem in the future?

Advice:
Create your posts on the dashboard of your own blog
Dashboard > Posts > All Posts > Add New

Or use an offline blog editor so you always have backups on your own computer http://en.support.wordpress.com/xml-rpc/

Why is it only showing my earlier saves and none of my later ones? How do I avoid this problem in the future?

However, you can register another blog with a similar name. http://en.support.wordpress.com/register-a-blog/

Or you can register a domain via a domain mapping upgrade and it will not matter what the underlying .wordpress.com address is.
http://en.support.wordpress.com/domain-mapping/
http://en.support.wordpress.com/domain-mapping/register-domain/

Thanks in advance!

http://wordpress.org/

Did you have a base WordPress.COM blog? if so what is the URL of all of them -

(If you're comfortable editing your hosts file, you could force your browser to associate your domain with the wordpress.com IP address, so you can change it yourself.)

@RC - always the fault of the system when people give the wrong rights to the wrong person -

Administrator
An administrator has full and complete ownership of a blog, and can do absolutely everything. This person has complete power over posts/pages, comments, settings, theme choice, import, users – the whole shebang. Nothing is off-limits, including deleting the entire blog.

Only one administrator per blog is recommended! http://en.support.wordpress.com/user-roles/

rc2lemniscata.wordpress.com is no longer available.
The authors have deleted this site.

It's history. Please read what I posted above.

rc2lemniscata.wordpress.com is no longer available.

The authors have deleted this site.

Gone is gone forever - search engines probably have a lot of your content

PS - having a lot of Admin people leads to this on a regular basis - thou should not have a lot of Admin's

However, you can register another blog with a similar name. http://en.support.wordpress.com/register-a-blog/

Or you can register a domain via a domain mapping upgrade and it will not matter what the underlying .wordpress.com address is.
http://en.support.wordpress.com/domain-mapping/
http://en.support.wordpress.com/domain-mapping/register-domain/

I'm playing a game called RC2,
I'm in really good clan,
so, we made a website, http://www.rc2lemniscata.wordpress.com
and then, the person who made the site, left the clan,
and she deleted our site today, because she got mad at us.

So now, dear developers, i ask you, is there any way of getting our website back? We put hours and hours of work in it,
we are all very angry, and awaited a soon response,

Greetings, In name of Lemniscata clan, Phoenix

It sounds like you already imported things to the WP.org site; check it and make sure. Check older posts and media as well.

And if I delete it will I still have my registered domain name or does that get deleted as well?

This support forum is for blogs hosted at WordPress.com. If your question is about a self-hosted WordPress blog then you'll find help at the WordPress.org forums.

If you don't understand the difference between WordPress.com and WordPress.org, you may find this information helpful.

If you forgot to include a link to your blog, you can reply and include it below. It'll help people to answer your question.

This is an automated message.

I had deleted my wordpress.com blog, "bobbytnguyen.wordpress.com" before removing the domain mapping to "bobbynguyen.com". I realized I needed to host my own blog for customization. I am hosting on bluehost. It was working for a little bit, but now when I access "bobbynguyen.com", I'm directed to my deleted wordpress.com blog.