Hun, do not harm yourself. There actually may be no spirit, instead it may be an onset of schizophrenia or psychosis which could lead to your hearing voices and even smelling smells. I am not a specialist or professional so I am not diagnosing you, but I think you need to tell your T or pdoc, you may need medication for this, no candle or incense is going to work if you are struggling psychologically and may need medication to help you with it.

IMHO, you did some things that brought you a sense of safety, which would reduce stress, and that alone could reduce symptoms of some kind. You may be building up more anxiety which is encouraging you to hear voices again where you think you are being told you are not wanted. The clue is the you are not wanted messages, those are often brought on by psychological challenges, not actual evil spirits or ghosts.

There are many psychological challenges that bring on the feelings of "unworthiness" or "not being wanted or good enough", I have PTSD and I have been challenged with that feeling many times over.

You need to tell your treatment providers. And if you need to sleep on the couch until you can get an appointment to reduce stress so you do not struggle with hearing voices and smelling smells then do so. Never, harm yourself, because you "can" be helped.