Unable to Add/Edit/Update/Post – Admin account corrupt?

I was using hosting with a website called sharkserve.rs – after about 5-6 months they randomly told me my website had too much traffic it was lagging out the other users on shared hosting. I migrated my website from them to a new host (host-stage.com) and from there things have been good, until today.

When I go to make a new post, new page, duplicate a pre-existing page, attempt to create a new user or change the settings on my admin user I’m unable to.

When I try to make a new post the post editor (where the content/text/html input box is) has been removed, and my only option on the right hand side is to “save as draft” or “submit for review” – no post button, and I am the only administrator / only account.

When I create a new account it’s completely blank, unable to be edited or even logged into, although it does process SOMETHING during creation.

When I try to upload any file or image, it won’t work.

I’m unsure what to do right now, can anybody help me? Is it my WP admin account that’s messed up or what? I’ve also tried the following:

-Disabled all plugins – did nothing
-Changed theme – did nothing
-Updated WordPress to newest version – did nothing
-Disabled Cacheing plugins – did nothing
-Checked with my host, and I was told this:

“I checked many factors on your websites and it seems to be a wordpress issue.
It isn’t coming from the .htaccess nor the plugins folders but I can’t create another administrator user and that’s not usual. There is also a white username without any value.
I tried to repair and check your mysql database but it seems to be working properly without any error.

I would warmly suggest that you reach the wordpress community about your issue.”