Commanding Entity in Head

I'm new to having an IT in my head, but I'm not sure if intrusive thoughts or voices, I've always thought I don't have voices, so I have no idea what I'm experiencing and that troubles me since I don't know what to expect or how to counter.

The IT has a very stern and icy tone when issuing commands, especially if I don't comply at first. Yesterday it told me that I needed to hit my head hard against a tiled wall, but I didn't want to since I have my bridal shower in a few days and I don't want to have a bruise on my forehead. Fortunately we reached a compromise that I would whack my elbow into the wall. That hurt! I thought that would be the end of it... But then it told me to do it again. I tried to do a couple of half hearted attempts, but the IT made me try again and again until I ran out of the room to get away from that wall.

This morning IT said it was pleased that I have a painful bruise on my elbow now. But what is going on?? Is this an entity, voice, or intrusive thought? I'd rather none of those!

Can anyone relate? I've been diagnosed with paranoid schizophrenia for 10 years and I'm 27 now and nervous over this constant lack of control. I'm trying so hard in weekly therapy, but it's as if I don't even know myself and why I do / think / act on self injurious behavior.

I don't know how to make sense of myself, much less the world.