Sync all Notes (from email addresses) to iCloud

Hello there,

I've recently discovered my Notes to be split up over the years across three email addresses, one of which was a college email address and has since been disabled (yet this is the one my latest Notes have been added to).

I've searched so hard to find out how to transfer all my Notes from the three email addresses onto my iCloud account, but I really can't find anything to explain if and how this is possible.

My Notes contain a lot of important information which I fear I might lose (especially since the Notes for the last two years have been synced to an email address to which I no longer have access).

Thank you in advance for any suggestions: I am rather concerned,

Adam

(I am using an iPhone 5S running on 7.0.x but I'll update if need be.)

(Just so you know, on the off-chance that it be relevant, the built-in Mail app has not functioned for two or three years. I attempt to open it and it closes before it loads.)