Hi shahadkh,
Thanks for posting in Apple Support Communities! From our understanding, your Notes have randomly disappeared from your iPhone, do we have that right? You mentioned that you do not have a recent backup, were your notes syncing with iCloud? We see that you are coming from this article: If you're missing notes on your iPhone, iPad, or iPod touch, were you able to try those steps? Have any accounts been removed from your iPhone recently?
If no account was removed, the notes are not in the recently deleted folder and there is no recent backup, it would not be possible to recover your Notes.
You can check for any software updates that may need to be installed, since needing an update can cause unexpected behavior.
Update your iPhone, iPad, or iPod touch
We'd also highly recommend keeping a recent backup at all times to prevent losing your data: How to back up your iPhone, iPad, and iPod touch.
Have a good one!