[MwhwF6bp]

It doesn't really matter as much as to who or what is taking/moving your things, as it does to why it is happening. Perhaps the reason alone is to capture your attention, so that you become interested enough to find out what the heck is going on, so that you begin a leg on your life's journey to discover truth for yourself - about who you are, why you are here and learning about the power you have to use this amazing energy (that moves your stuff), so that you can harness and direct it (with your mind - your free will), and create the best life that you can for yourself in this experience of life you are having now.

You definately aren't going insane, although sometimes it can feel that way. Practical advice if you simply choose to have this entity stop doing it? Acknowledge it. Do this in your mind or out loud. You can tell it you have become aware of it. If it is an earthbound entity, truly, just talk to it like Jennifer Love-Hewitt on ghost whisperer. (I've done this - and believe me, I don't feel any more crazy when talking out loud to a ghost to get it to move on than I do when I find my things missing and apparitions here and there.)
Sometimes they don't leave straight away, so asking what they want is always good too.
Meditation definately helps, as does creative visualization. You can actually use the available energy of the universe and with your will, focus your attention - in your visualization, onto bringing to the source of your manifestation (your ghost) healing energy - eg, Jesus, Archangel Michael, High Vibration Guides, Krishna, etc. Be persistant, and do this with the sense that you are serving another for the good.

Thought creates reality.