There are some plugins that handle this very well.
Search in new plugin for https redirect.
They are very easy to use.
It will be in the same folder as wordpress is install in.
Or ask your host to restore if that was the only change made today
Try using a different browser.
Worse case you can edit the config file but you need to be familar with FTP software to do that. If you need to FTP in edit back the url to how it was previously.
