Is there any point in me emailing to explain my clumsy error in hopes of them reopening my case saving me money and more importantly time?
I'm also worried if I don't explain myself they will think i was trying to hide something and it will affect my next application
Not much point in emailing them I'm afraid, it was a mistake on your side.
Don't worry about it impacting a future application - unless you deliberately gave them false information, this wouldn't be counted as misrepresentation.