I am praying it's some kind of system issue but my quickbooks online all of a sudden I have no invoices, customers, or transactions. They're all gone

Welcome to the Community space.

Know this isn't the experience we'd want you to have when using QuickBooks Online (QBO) to manage the recording side of your business. Our main priority is to provide the information to our customers as concisely as possible to help them address their concerns on time. Upon checking here on our system, there aren't any reported cases similar to your situation. Also, reading your post, it looks like this has something to do with your browser. That said, we'd recommend performing browser troubleshooting to rule out the possibility of being in this case. If you wish to continue with this method, you'll want to access your account in an incognito or private browser. You can use these shortcut keys:

• Chrome: Ctrl+Shift+N
• Firefox: Ctrl+Shift+P
• Safari: Command+Shift+N

Once you're in, try to check if your invoices, customers, and transactions are present. If it works, you can proceed to clear your browser's cache. Refer to this article for the steps: Clear cache and cookies to fix issues when using QuickBooks Online.

You can also use other compatible browsers if the issue persists. Refer to this article to see the list of compatible browsers in QuickBooks Online: Other browsers.

Furthermore, here are some articles to help you manage invoice payments, and ensure to keep track of your data inside QBO:

• Record invoice payments in QuickBooks Online.
• Run reports in QuickBooks Online.

We're determined to help you get through this. Please don't hesitate to reply below or visit us again anytime. We'll be here, and we've got you covered. Take care, and have a nice day!