how do you rotate a drawing view by a specified angle

I can also get the dialog up by clicking the rotate icon on the heads up

If you don't have that, you can right click on an empty section of the menu bar and select customise. Go to the commands tab, select view from the categories list, then drag the rotate icon to any menu you want it on.

It's probably off your screen viewable area somewhere.  Try finding a setting for "enable dialog box repositioning" in your display driver/graphics card settings.