if I had hide my email on when I sent my email but take it off after, will the person see my email? and would I be able to respond if I turn off hide my email?

Hello Anooche,

Welcome to Apple Support Communities! We understand you want to know if you turn off hide my email after it's sent, if you can respond and will it show your email address. We're happy to assist you with this. 

If you need to show your email, make sure you turn this feature off and delete your created emails prior to replying to your contact. You can read more about this feature here: 

Create unique, random email addresses with Hide My Email and iCloud+

Set up and use Hide My Email in iCloud+ on all your devices

Best Regards.