Notes missing

Hello,

70% of my notes are missing. I've just unlocked my phone, and they're gone. I've done nothing new in any of my Apple devices (ipad, iphone or macbook). Do you know if it is possible to restore the old notes? I had them backed up to iCloud, but even when accessing via web, they're gone.

This is a major mess, can't believe it's happening.

Thanks and regards,

Fernando