People who move your things

I can't express how frustrating and angering it is when someone moves your stuff and doesn't tell you. For me, it's not solely the fact that my things are moved, but the fact that I can't find my things anywhere. I have diagnosed OCD and this type of thing is really stressful for me no matter how minor it is. I can be missing a pen and get emotional over someone moving it, even though it's of no importance to me practically and I could use a different one