1.OK, maybe the first step is to determine if you are really dreaming the future, or if you are just making really, really good guesses while in the dream state. Keep a log of your dreams when you get up. Then, on one of the minor dreams, do something different. Say that you dream you bought mint gum -- deliberately buy cinnamon gum.
My bet is that you are really just making good guesses, or that you are experiencing deja vu -- which is where the brain kind of hiccups and repeats the last few minutes of your life. You can't tell where it came from, so you think it's a dream.
If they are just good guesses, then you can deal with it by ignoring it, or taking advantage of it.
2. I would like to know what weird things are happening to you. What do you mean by saying weird? Do you here noises? Do you have scratches on your body after sleeping? Or do you just hear noises from the outside and being scared? Please describe the exact situation.
3. A "demon" is an imaginary being, representing a personification of evil. So this dream symbolizes personal invasion and/or control by some evil power. In the dream, the "demon" could represent some authority whose control over one's self is resented; for example, a boss or supervisor. Alternatively, the "demon" could symbolize an addiction or harmful habit over which the dreamer feels no control. The demon is also a very common mechanism for removing guilt from oneself and projecting it onto something else. For example, a man might decide that he is innocent of lustful thoughts by convincing himself that a demon is responsible for that lust.
4. If you have a dream about committing suicide then it is obviously very disturbing. Yet its meanings may not be so bad. Dreams tap into situations where we feel similar emotions. Several suicide dreams in our study took place when the dreamer had been thinking about 'giving up' on some relationship or project. Thats identical to the feelings of someone who is suicidal - you just want to give up. Its the same feeling but just much more extreme in the case of a depressed and suicidal person. But that is how dreams work. The mind obviously used the suicide to show the strength of feeling as the dreamer was completely dejected with a project and simply had to give up.
Suicide may link to mental illness but you need not fear such dreams. They merely reveal emotions that you are obviously aware of. They may show that you feel a total lack of purpose. You may feel very unhappy and even very depressed. One dreamer who had a suicide dream had been feeling suicidal. But anyone that desperate will obviously be already aware of their unhappiness. The dream will not shock them. Its probably not a premonition of what is to come. Dreams will often reflect the choices available to us - and if you are that desperate then your mind may toy with the idea of suicide.
I hope things will get better to you!