what can i do if i gave personal information into a fake email

Not much we can advise you on that.

At a minimum, I would suggest you change your Apple ID Password.

Change your Apple ID password - Apple Support

If you provided any credit card details, I would suggest you call your credit card company and cancel the card, requesting a new card.

Finally, if you do not have credit monitoring through your bank or the primary credit reporting agencies, you should set that up immediately, so you can keep tabs on your credit.

It depends on what personal information you have provided.

Bank info --> Contact your bank

Apple ID --> Change your Apple ID password

iPhone Passcode --> Change it