As to demons, can the Catholic Church do exorcisms? Yes. A priest can do that, but I am pretty sure that you will also need to be in psychological treatment before one is attempted. We are unlike some other churches which will automatically assume, on face value, that this is possession.
As I say, there have been cases like this where it is possession. There have been cases where it is not. So, in its wisdom, the Catholic Church, I think pretty much would ask you to seek counseling, in addition. That’s how it would probably handle your case, or pretty much any case, I think.
At the very least, it would need to rule out mental illnesses. If you are in treatment and still having these things happening, I think they would consider helping you.
However, there is a danger, with such things that an exorcism could do more damage, if it’s not possession. Well it would reinforce it. Do you see how?
So, this is why you must seek professional treatment, because I believe that’s what a priest would require, anyway.
With demons, nothing is ever guaranteed, but since the Catholic Church is the one true Church, I think it would be the place to go in a case of possession. I believe the Catholic Church to be the only Church established by Jesus Christ and the rest, who are not in communion with it, to be in schism, split off.
These churches can’t all be true. I’d encourage you to come to the one true Church, also, as a first step. Priests have been given DIVINE authority. Peter was given the keys to the kingdom, told what he held bound would be held bound, that what he loosed would be loosed on earth and in heaven. The other churches are not acting with God’s divine authority,
I encourage you to get right with God, to go to RCIA in order to be able to also confess your sins. We believe that confessing to God is not the way he intended it to be done. Christ gave divine authority to the apostles to forgive sin. He breathed on them saying to receive the Holy Spirit, that what they forgave would be forgiven. Now, other modern churches say to ignore this, to confess directly to God, NOT go through the Church that Christ set up.
If you are going to overcome this, you will NEED the Church, to believe it in it, fully…Get right with God, the Church, also as a first step.
You can’t on the one hand go to all these other churches and then seek help with the Catholic Church. You need to make a decision, make up your mind. You can’t be in and out with the Church like that. It will not work. Either you believe in the Catholic Church, its representatives, or you don’t. If you believe, you need to become a part of it, leave all these other churches.
Christ established only ONE church. He said to Peter that he would be the “rock” on which the Church would be established, that the gates of hell would not prevail against it. He asked him, 3 times, to shepherd the Church. Now, when you reject the true Church, you reject Christ.
When you go to other churches, that is a mortal sin as you are rejecting God’s representatives to follow other man-made churches. So, you need to stop doing what is sinful.