Internal Server Error

Hi, I changed the WordPress Address (URL) and Site Address (URL) by mistake in WordPress>settings>general (I know, stupid). I read through the various guides on WordPress Codex and figured out how to change back these values using MyPHP.

However, although the front page is now corrected, all other pages give me “Internal Server Error”.

I found a plugin through Codex, named Velvet Blues Update URLs, however I cannot remember what I changed the URL to by mistake (old URL). Is there a way to locate this in SQL for the pages? This way, I can enter that value for the old URL into Velvet Blues and that will hopefully fix the problem

Many thanks in advance