If you any acces to your file, please rename your active folder of your theme. Upload or active another theme. Check if the problem is resolved. If not, you can change your theme back. Otherwise there are some problems with your theme.
If you have update the core files of WordPress by an update, it's lookslike your theme are not compatibel with WordPress 4.4.2 in my opinion. Did you have a backup with an earlier version (before 4.4.2). You can upload this core files with Filezilla. Don't upload any other file in wp-conten and don't copy .htaccess to your server.
If you want, I will check it if you don't know how to do. Hopefully it's will help you!
Warning!! Before your change something, please make a back-up of your website and database! I am not responsible for errors or demage.