Ah, PHP can be pretty unforgiving sometimes, but all is not lost.
Do you have access to your site via FTP or File Manager?
If so, navigate to
wp-content/plugins and delete the plugin folder you used for adding your PHP.
Depending on which plugin you used, it should be called
Your site should be back then.
If you don’t know how to use your File Manager, call Bluehost and get them to do it.
Once that’s done, your site will be back to the way you left it 🙂