Retrieving session data in class instantiated with a Service Provider

Hello,

I'm trying to set and retrieve Session data in a class that is instantiated with a Service Provider. Setting the data works fine, but after refreshing the page the data is gone. I know it has something to do with the order of bootstrapping the Framework but I can't figure out how to make it work.

Here's my Service Provider:

namespace App\Providers;

use App\Illuminate\Profile\Profile;
use App\Illuminate\Contracts\Profile\Registrar;

use Illuminate\Support\ServiceProvider;

class ProfileServiceProvider extends ServiceProvider
{
    /**
     * Bootstrap the application services.
     *
     * @return void
     */
    public function boot()
    {
        //
    }

    /**
     * Register the application services.
     *
     * @return void
     */
    public function register()
    {
        $this->app->bind('App\Illuminate\Contracts\Profile\Registrar', 'App\Illuminate\Profile\Profile');
    }
}

And here's the 'App\Illuminate\Profile\Profile' class:

namespace App\Illuminate\Profile;

use App\Models\Profiles;
use Illuminate\Http\Request;
use App\Illuminate\Contracts\Profile\Registrar;

class Profile implements Registrar
{

    /**
     * The current profile
     *
     * @var object
     **/
    protected $profile;


    function __construct(Request $request)
    {
        $this->request = $request;

        $this->setProfile($this->getHost());
    }


    /**
     * Returns the profile or an object value
     *
     * @param string
     * @return mixed: null or a string which corresponds to a database column
     **/
    public function get($value = null)
    {
        return is_null($value) ? $this->profile : $this->profile->$value;
    }

    /**
     * Sets the current profile (override)
     *
     * @param string
     **/
    public function setProfile($host)
    {
        if( $this->request->session()->has('profile_override') )
        {
            $host = $this->request->session()->get('profile_override');
        }

        $this->profile = Profiles::where('host', $host)->firstOrFail();
    }


    function switchProfile($host)
    {
        $this->setProfile($host);

        $this->request->session()->put('profile_override', $this->profile->host);
    }


    /**
     * Returns the http host
     *
     * @return string
     **/
    protected function getHost()
    {
        if( env('APP_ENV') == 'local' ) 
        {
            return env('PROFILE_LOCAL');
        }

        return implode('.', array_slice(explode('.', $this->request->server('HTTP_HOST')), -2));
    }
}

I'd like to switch profile using the switchProfile() method from anywhere in my application. At that point, the Session data is updated with the correct key and value. But when I refresh the page it seems to be gone. Can someone please explain why?

Another question, unrelated to the problem above. Why can't I typehint the Request class on a controller method? It only works in the constructor. When typehinting in a method I get the following error: Argument 2 passed to App\Illuminate\Profile\Profile::setProfile() must be an instance of Illuminate\Http\Request, none given.

Any help would be appreciated!