The tampons and stopped toilet might make a bit of sense if it's harrassment. One way to stop a toilet up would be to fill it with bunch of tampons and flush, I guess. . . I'd think most people wouldn't bother buying tampons for this purpose and just throw your stuff in there. The shit in the garbage doesn't make a lot of sense either, but I suppose if someone were doing this, they are not the most rational person.
Given your condition, talk to someone close to you and see what they suggest or if they can help. I suggest you set up the camera, get record of service if the plumber was called in, take date and timestamped photos of vandalism etc. Bring it up with your doctor or therapist, and contact the police instead of going over possibilities by yourself.
You'll have difficulty making a case that this is real, to others (and maybe to yourself). That wire and plate plan was not good. You need tangible records that are uncoloured by your judgement, because what you perceive is not reliable.
But yes, contact the authorities when you have some evidence or video, and be safe. Please ignore all the people suggesting that someone with paranoid schizophrenia would be better off armed.
I really hope this turns out to be nothing, but I don't want to be dismissive. People might not take your concerns seriously due to your condition and that makes you a pretty vulnerable target - being able to prove it in concrete terms is crucial here.
