Hey, first just chill out. It sounds genuinely exhausting and scary, and I hope you find some relief soon.

This forum is mostly for GitHub-specific technical questions so we're a bit limited in what we can help with here, but I didn't want to just scroll past without saying something.

If someone is stalking or harassing you online and has access to your devices or accounts, the Cyber Civil Rights Initiative (https://cybercivilrights.org) has a crisis helpline specifically for this and they actually know how to help in ways that general legal channels often don't. The FBI's IC3 (https://ic3.gov) is also worth a report if you haven't already since they handle cybercrime specifically.

For your GitHub account specifically, turning on two-factor authentication, reviewing your authorized apps under Settings, and checking active sessions are good starting points. But it sounds like what you're dealing with goes beyond just GitHub.

Please take care of yourself. You deserve to feel safe.