Q: I forgot not only answers to security questions but also rescue email addres .

You won't be able to view and/or change your rescue email address until you can answer your questions, if you can't remember it then you will have to contact Support in your country to get the questions reset.

Contacting Apple about account security : http://support.apple.com/en-us/HT5699

If your country isn't on that page then try this form and explain and see what they reply with : https://ssl.apple.com/emea/support/itunes/contact.html

When they've been reset you can then view and/or change your rescue email address for potential future use : http://support.apple.com/en-us/HT201356

Or if it's available in your country you could change to 2-step verification : http://support.apple.com/en-gb/HT5570