I'm sorry to hear that, I've heard this happens a lot unfortunately.
Some people have said this plugin helped: https://felesmachina.itch.io/rigodotify
I'm not sure if it still works but I don't have much experience in Godot so I can't help as much as I'd like. Though for the future if you are planning on really doing game dev I HIGHLY recommend buying Auto Rig Pro. It's $50 but I use it more than any other plugin and you can literally rig a character in seconds with it.
I also found this thread on reddit, but again not sure how much it will help: https://www.reddit.com/r/godot/comments/126b28p/has_anyone_had_issues_importing_...