There are times in my house when something falls off a shelf in the closet for no reason. I hadn't moved anything in there, just shifts subtly and creates a racket. Doesn't happen often which makes it all the more creepy when it does.

The footsteps are a little harder to explain. It could be hallucinations. It could be a result of prolonged depression or it could be because of your meds... but either way the thing to do, like candybear said, is to be sure to tell your pdoc. It may be nothing, but if it is nothing, let your pdoc tell you that it is nothing.