Hello , sorry about your problems. My name is Marco and I will do my best to help you.
Try this solutions:
Update iTunes to the latest version and ensure your iPhone is recognized by iTunes when connected via USB.
Temporarily disable your firewall and antivirus software as they may be blocking the tethering connection.
Or you can try this: Disable USB Selective Suspend setting on your PC to prevent power saving from interfering with the USB connection (Control Panel > Power Options > Change Plan Settings > Change Advanced Power Settings > Expand USB Settings and disable USB Selective Suspend).
Source: https://answers.microsoft.com/en-us/windows/for...
Use a different USB cable or try connecting your iPhone to another PC to isolate if it's a hardware issue.