Thank you for your help.
I deactivated all the plug-ins (I didn’t realize I had any) and it seems that the Jetpack plugin is causing slowness and causing photos not to load – isn’t this something I want to keep though due to all the extras?
Also, I’m trying to delete and re-upload everything, but for some reason it’s not working. In my FTP I’ve deleted all my uploads, but when I try to install the .xml file again it says all those files exist already. I don’t know what else I need to delete, I’m afraid I’ll delete a file that I need to keep. I’ve looked at instructions on how to delete and re-install WP completely, but I don’t fully understand them. ??