Can't find my purchased apps after changing the country ?

That is how it will show, all content is tied to the country as well as to the account, items will no longer show in the Purchased tabs in the store apps for redownloading for free.

For apps if you try to redownload an app from the main part of the store you should (based on what other people have posted) get a prompt saying that you've already bought the app and would you like to redownload it for free - try a free or cheap app and see if you get a similar prompt.

For media (music, films, tv shows) you will have to pay again if you want to redownload them.