I know the feeling. Same thing kind of happened to me. When I was younger I had permission to hunt private land with the owner and his sons. And I worked for weeks, walking the property and learning it. Found an excellent spot to hunt from and shot my buck opening morning. The next year, I was informed that the owners son would be using the spot (and even the brush blind I built) and that I needed to find a different place to hunt.

After that I made it my goal to own my own hunting land. And once you own the land you can understand why some landowners are so anal about keeping others off the property.

I hope you find a spot, keep low, watch for orange around you, and make noise when you walk. Public hunting lands are dangerous IMO.