Can’t add images or tags

Alright, so a couple days ago, I suddenly was unable to add images to my posts. The add image icon is simply not there.

I also cannot seem to add tags. There is a space to add tags, but no “add tag” button, and the “add popular tags” function is not there.

Also of note, in my dashboard page, on the left sidebar, I cannot drop down anything. For example, if I click the triangle next to “Appearance”, it does not drop down to show me the “Themes, Widgets, Editor” options.

Help?