Hello E.
I just read about the issues you are having. Since you tried everything that Reece, Vienna, Bleiente and Cyborg322 have mentioned, try this.
To fix the missing boot options :
-Disable Fastboot
-Enable Launch CSM
Go to Security tab and disable Safe boot.
Grab a
Windows disk and put it in, If you have it.
Restart the computer and hold in ESC.
You will come up to a Blue box and from there you just choose your Windows Disc.
If this doesn't work and if you have the recovery disc or made one, insert it. The computer should compare your system and the recovery disc and migrate missing files from the recovery disc to your computer. This should replace and missing files, if there are any and repair it.
If not, the previous steps should restore the boot order to your HDD.
If the HDD suffered any trauma like dropping it or the computer case fell, The stylus in the HDD may have crashed into the disc and at that point, the HDD is toast. SSD's don't have this issue.
Good Luck E.