Missing Apple Music songs after iOS 26 update

As of 7am, I noticed that 90% of my Apple Music songs were missing. All that’s left is music purchased in iTunes over 10 years ago. When I searched for these songs again, it shows they were never downloaded. I’ve lost HUNDREDS of songs that I can’t seem to get back, and this is one of many glitches experienced with this new update. I have been paying for an Apple Music subscription for years and now it’s doing me no good. How can I retrieve all of my missing music without individually downloading each song AGAIN?

[Re-Titled by Moderator]

Original Title: iOS 26: Apple Music