404 error when trying to post

I am currently on a month long RV trip. I have been blogging the trip everyday from various hotspots. Yesterday I was doing my nightly blog and half way through I started geting 404 errors. I had uploaded my images to my gallery first – worked aok. Then I update my map – AOK. then I wrote out the days post – aok, then I tried to add the days images to the post. No go. I get the following error now whenever I try to post or upload anything…

404 – Not Found

The page you are trying to access does not exist.

If this error persists, please contact the website webmaster.

If you are the webmaster of this site make sure that: •You have uploaded correctly your files to the public_html directory which is the web-root of your account;
•You have not misspelled the URL. Bear in mind that letters are case sensitive and no blank spaces are recommended;
•In case you have applied SEO – SEF URL rewrite rules, make sure you have renamed the htaccess.txt file to .htaccess. If there is already a non-empty .htaccess file, check it and make sure the necessary rules are uncommented.

I had not updated anything during my trip, but since this error starting I updated my plugins and my wordpress version, this has not helped. I have also tried different themes, this does not help either.
Could this issue be becasue of a hotspot I logged into? I’m at a loss here, and can’t blog at all anymore. I can access all my admin stuff, I just can’t post or upload any images.

Please help!

Blog site is http://www.rvcanada.raivensnest.net

**I’d like to add that I was just able to upload my pics into my nextgen gallery no problem, and I updated my google map with today’s marker, so all that is working. It appears I can also create a new page, but whenever I click the post button I get the 404 error.