How do I cast off a demon?

All the things you describe are normal life events, not supernatural manifestations. Start taking responsibility for your life and work to improve it.

Good luck.

This sounds familiar. You remind me of this girl I was friends with for awhile. In her case it wasn't actual demons that were causing all her current troubles anymore. She kept trying to cast them out, but they were already gone. But she didn't realise that casting out a demon (like removing a rock) leaves a hole. And you have to fill it up with something good. Also you need to move around the dirt some (change some habits) so that it doesn't have a place in your life for it to come back to. But that would have been more work, so she kept trying to cast it out over and over again. It never worked. She needed to move on. Fill her life with better things. Change some of her habits in how she lived her life, or how she dealt with poeple.

Having demons teaches you some bad habits. And people who cast out demons usually forget to change those, which only eventually invites whatever demons they used to have back in. It's like a really bad cycle. To break it you need to look at your life and decide what habits to change, and what parts of your life bring negativity. And then have the strength to get rid of those too. A therapist could be of big help here. I know having a therapist has helped me with some things in my life. Anyways, I hope this helps. And I wish you the best!

Start getting proper education in true science and true religion.

Use incenses/oils (dress a white/black candle in this oil and burn) like sage, franakincense, myrrh, dragonsblood, cedar, basil
Sprinkle sea salt water and ask it be blessed by the gods, garlic, black pepper, onion,
and other herbs for protection and banishing such as:

elecampane, st johns wort(good for healing also), angelica, borage(for positivity, courage, protection), brimstone(banishing and banishing of spells and hexes), dragon's tear seeds(a potent uncrossing herb which is commonly known as the species bixa plant bixa orellana/annatto/achiote), mullein("graveyard dust", also good for effecting change), Rue.

Focus your energy on visualizing and affirming that negativity be gone and your house be cleansed.
On the candle
wear the stone onyx or which will dispel negativity, wearing scorpions or scarab beetles will work, and sapphire protects against a lot of things.The most effective Wiccan protection symbols are the pentagram, the triple moon Goddess symbol, the Ankh, the maze like Hecate symbol, the Eye of the Horus, The Ohm symbol, variations of the Cross, and the triskele are the most used of protection symbols. The runes algiz and jera of the elder futhark runes.
carve these symbols into your burning candle etc.
Make sure you open all the windows and doors so the spirit can get out. You may want to give it an apology, you might have summoned it against its will and its mad about that, tell it it's free and to go back whence it came.
There are many protection and banishing spells you can look up.
In the future when you practice these things make sure you look up the topics of circle casting, purification/banishing, and psychic/spiritual defense methods for warding.
The lesser banishing ritual of the pentagram is supposed to be a powerful banishing ritual.

I pray in the name of St Michael and through the power of the blood of Jesus to rid you of all evil influences in your life. May angels protect you and lead you in the ways of light. Amen!

lay off the acid.

Get help from a priest or preacher who is experienced in these things. You've got to believe in the power of good and God as much as you believe in the power of evil and demons.

Pray to our Heavenly Father and contact your church for help.

Stop believing that crap. But while you still do, mud and a carrot outside your doorway in a glass.

If all of these bad things you listed happened on the same day, I would agree you have a case for demons. But I'm guessing that you've describe a series events over a period of time....otherwise known as life.

Walk out your front door, find a new life and get on with it.

Such things can only have might over you if you let them. If you "feed" them, maybe unconciously. A deal consist of giving and taking. What do you give them to stay with you?
Some people get ill, because they unconciously want to be treaten. So we may want to deal with negative things because we hope for positive results in the end.
Don't be a slave or a victim, demand back the responsability for you live, and act like that.

Make him walk the plank!!

there are no such things as deamons. Use reason and look for rational explanations to your problms if you want to actually solve them.

mayhaps - since it was the occult that summoned them it is the occult that will drive them away?

holy water
salt
signs against evil
iron
light

or ask it what will make it go away

blood sacrifices might help. . . :)