Welcome to the Club!
I had a similar issue around 2 years ago now on POP where my bootloader didn't even show up in the bios anymore.
If you still have the a USB with the live boot of POP you can use it to recover your files n stuff.
From Wikipedia, the free encyclopedia
Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
Community icon by Alpár-Etele Méder, licensed under CC BY 3.0
Welcome to the Club!
I had a similar issue around 2 years ago now on POP where my bootloader didn't even show up in the bios anymore.
If you still have the a USB with the live boot of POP you can use it to recover your files n stuff.
What errors do you get on boot? Also, are Windows and Linux on the same drive, or separate?
thats strange, my boot menu has 2 kernel selections for pop os, the current one and one that is the previous running kernel. if a pop os update breaks my system i can just boot from the other kernel image. which has only happened once in 5 years. but was able to wait for pop to push fixes etc and then dist upgrade.
since you dont seem to have that option, you may need to boot from live usb and investigate further.
when you try to boot into it what happens?
This is common in rolling releases, but Pop OS isn't a rolling release distro. Maybe a package you installed or something similar?