Need Help on how to get health insurance while traveling

The only thing my insurance covers out of state is emergency room. Well that's great but if its something that needs surgery or if you have a stroke or something, that emergency room coverage wont cover it. I'm not old enough for medicare yet. So basically no one knows of any policies or coverage that covers you out of your own state? And basically the way the insurance works nowadays, you are held hostage in your own state, or pray that nothing happens to you when you cross state lines.