Page Template has been corrupted :-(

I was trying to fix a coding error for my RSS feed on my Page Template and inadvertently corrupted the page.

Now it loads for a second or two . . . and then fades to blank.

I had copied the old HTML from the Page Template on the Editor to a Word document. Then my “fix” didn’t work, so I recopied the text from Word, re-inserted it, and now the problem.

HELP, what can I do to STOP the fade out?