** Just so everyone knows, the term "smudging" is a Native American term, and is culturally appropriative to use. It is also culturally appropriative to wear the hamsa (and use as decoration/ for ritual) if you are not of Judaism / Islamic / other Middle Eastern Religions. **

Someone on here told me a while ago, that if I feel bothered by it, to imagine a protective bright light around me in a bubble, and visualize myself being safely inside it. Also, visualizing the bright light surrounding the entity and sending it across the universe can help, too.

I would look into protective gems such as Amethyst, and herbs such as Elderberry and Wormwood. Also, incense would help.
Something I do to help when I'm in a situation like you, is to get my gems and any herbs, and create a small space in the room the entity usually occupies. Then, after anointing the gems with oils of protective herbs, I'd anoint myself on the forehead, and say a protective prayer. (The prayer can be either a general protective blessing, or a protective prayer from a religion you are part of). Then, I would light the incense and concentrate on visualizing the smoke from the incense taking the spirit away from you and your house. It would help to leave a window open.
After the incense is done burning, OR before you do the small ritual, you might want to clean your room for physical cleanliness and so it symbolizes you ridding your room of the entity. It really helps me.
This may not rid your house of the entity, but it might certainly help your mindset. Sometimes when you're more stressed out, feeling negative, depressed, etc. entities can feed off of your energy easier. Try keeping up a positive mindset, and tell yourself positive statements like "It will be okay, I'm going to get through this." "I am protected. I will not let this spirit effect me".

In the mean time you might be able to find some relief talking to a therapist about the psychological effects this is having on you. If your therapist dismisses your beliefs and doesn't listen to you about them, I would suggest trying to find one that is not biased, or perhaps you can find a spiritual person or forum you can consult with greater detail.

If I were you, I would also look into what would open the door to the other side/ create a pathway from you to the other side, so you can avoid doing anything that makes you noticed to entities behind that door. Praying doesn't necessarily open the door, and neither does offering things on an altar to a deity.
I searched through thousands of posts to find this, thus in turn almost overheating my computer. I've found it very helpful, and hope you do as well.
disclaimer: I don't want anyone sending anon hate to this person for linking them, and I don't necessarily endorse what kir says on their blog, ~but kir's post that I'm linking to aligns with my views.~here~

Korie Anders, I would like to finally say that I hope you are feeling better, and I hope this entity has been leaving you alone since your last post. Take gentle care of yourself and, you can message me any time if you want to talk. I'm not a pro in this area, but I've experienced things similar to this before, so it might help to know you are not alone.