How do I cope with feeling like a stranger to my own home?

You gave your working life to representing a home, and somewhere in all those years abroad, the home itself became a stranger. That is a quiet, real grief. You served a place, and the serving carried you far enough away that you no longer quite belong to it. Few people understand that particular loneliness. Here is what may help: home was never only a country on a map. It is people, language, small familiar things. Some of that you have lost, and it is right to mourn it. But some of it you can still rebuild, not as the place you left, but as something you make now, wherever and with whoever remains. So start with one thread back. A person you drifted from, a place that once felt like yours, a custom you set down. Reach for just one. You may not recover the home you imagined. But you can stop being a stranger to it by tending, slowly, what is still there.