Missing text on a saved document

I've never had this problem before, so I don't know if it's got to do with how Windows 8 is set up, if there's a bug with OneDrive, or what, but I spent all day typing up a document- saving it several times throughout -before I saved it one last time to unplug my computer and take it to my bedroom. When I plugged it back in again, started it up, and opened the document to go over it again, the entire document was blank. I could highlight a huge chunk of the paper, but there were no words, no indentations, and no separate paragraphs. My font had been Calibri, and now it says that it's Courtier New. What's happened? OneDrive online won't even open it, and when I copy the invisible text to a new page, to see if the page itself is maybe corrupt, the only thing that pastes is one line like someone tapped the enter button on a brand new page.
This frustrates me to no end, and it's happened before. In the past, I've caught it quickly enough that I can access it on OneDrive before it updates itself online, and I can save it. But the messed up file updated itself too fast for me to salvage anything this time.
In the past, I've also had this happened when I attempt to open OneDrive too quickly after restarting my computer. The whole page is blank, because the text hasn't been loaded yet because my computer was still connecting with OneDrive... or something... but then all I had to do was wait and open the document again and it would be fine. But now? Is it really anything to do with the cloud, or is it maybe my writting program (Which I hadn't had issues with before, but then again, OneDrive had been perfectly fine before also)?
It's just frustrating, because now I've got to type it all up again, and I feel like I wasted my entire day.

Which program are you using for writing. Also you say that "could highlight a huge chunk of the paper, but there were no words, no indentations, and no separate paragraphs" Font maybe set to white so it's invisible, can you change it's color in that program ? What kind of text file is it ? Can you open it with another text editor ?

I'm using Microsoft Wordpad, the free version of Word. And I already tried changing the font color, nothing happened. Changing the background color to permanently highlight the text worked, as if it were about a hundred lines of 'space bar'. But, when you use 'find and replace' for 'space' on documents, I know it works to find every space. It doesn't find any spaces in this document. It's .docx, if that means anything, and when I copy and paste it to another page, only one line copies.

Are your files available offline ? If they are not, when you click on a file to open it and your connection to internet is too slow or buggy, it might result in a blank document. This is because windows only keeps metadata of those files (things like description, thumbnail, title, etc...), not real content.

Here is a link on how to check/modify this setting :How to force SkyDrive to store your files on your hard drive in Windows 8.1 | PCWorld

I've got all my stuff available offline, but I do think you're pretty close. Because when I access my documents too soon after turning my computer on, the pages are always blank. When this happens, there's a notification in the top corner of my OneDrive app that says it's 7% updating (Or something similar) and continues until it's at 100%. After that, my files open perfectly fine. What I think happened was that I opened the document too soon and it was in that blank state that you described. It's happened before, and I've accessed OneDrive on the internet and pulled the file up before it updates as a blank file, or I wait until OneDrive is finished. Either way, it turns out fine, but this time there was a blank document on the online part too.
But I do have it all available offline, and I desperately want to know what's wrong with it, because this file didn't turn back to normal.