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As silly as it sounds, my 3D-view controls are missing. I'm not sure that's what it's called, but its the bottom part of the 3D view where I can select viewmode, layers and object modes.
How can I get it back?
What you're talking about is the Header of the 3D view - this can happen sometimes if you accidentally click on the top of the header and drag it downwards.
You can bring it back by clicking the little plus icon at the bottom right of the 3D View: