Robin
I use to have a lot of the same things that you are describing happen to me I'm 33 now and this went on for a number of years in my ealry to mid twenties.
I would hear voices. Hear them in the running water or in the squeak of a door or just in my ear or hear someone saying words but they would be saying something completly different then what was actualy being said
I had horrible dreams of demons and sleep paralysis (like your paralized when your just waking from sleep)
Anyway before all this happened I had given my life to Jesus and had the most beautiful relationship I had ever had with a person in my life and when after a while I started to try to find (other) ways to be more "spiritual" not realizing that this could open up the door to other spiritual influences which was formentioned. After the negitive influences I could barely read anything cause of the interferance and I would actaully see colors on the page of whatever it was I was reading and it seemed as if each color had its own agenda and train of thought that my mind would follow. Weird huh?
Anyway, I remebered the Love I had with Jesus, the Joy, the Peace the Clarity of mind and knew that I wanted it back and that was my goal... So I tried many things and fought hard to get this back and after a while I found the loving arms of Jesus open as if I had never left and the torment was gone (this was a process never give up).
People who havnt been there dont understand how miserable and lonely it can feel but something I learned during this whole thing was this. Those voices are there all the time speaking to people and the things through the tv and they always fight people because they have a mission which is inflict as much pain in peoples life as possible even to the point of insanity or death..
You could not even see these things or here them if you did not have a gift called "discernment of spirits" this allows you to see and hear into the spiritual realm.
Now to what worked for me. Call on the name of Jesus Christ if you have not asked Him to forgive you of all your sins and to live in your heart this is the number one and most important step! A lot of time the spiritual forces gain power through things that have kept us far from God like sins. Since GOD wants us close to Him and not far He allowed His Son Jesus to pay the price for sins for all mankind on the cross. When your close to Jesus the foul spirits can not be close to Him. The closer the better

Jesus saves you from all sin and the things that come along with it.
Please read the bible as much as you can starting with the new testament.
For more immediate releif try breathing very deeply through your mouth (eyes open). Breath as deep as you can in your mouth and out for at least twenty or thirty times. Also try fasting for a day or two and Pray often!
Also if you hear them talk to you and they are saying stuff that you know is evil tell them with authority to be quit and get away from you in the name of Jesus.
Say "leave now in the name of Jesus" With the same tone like you found your puppy pooping on the floor and it made you so upset! "GET OUT OF HERE IN THE NAME OF JESUS!!!!" God loves you so much and doesnt want you to live in torement. He wants you at peace and in a clear mind. Jesus Loves you so much that he died for your sins. That is a lot of love going on and its all for you and for many others who ever will accept Him as Lord. If you want to accept Jesus as Lord then you can pray right now "Jesus please come into my heart and forgive me of all my sins. I know that I have sinned and ask you to please forgive me and show me your Love" Remember You are stronger then they are!!!