Hearing voices and hallucinations?

[Venus]

Lately I've been hearing voices in my head telling me to kill myself and insulting me. Like calling me names. The voices sound like my friends. Some don't sound like my friends. Not all the things that have been said by these voices have happened in reality. I can't really comprehend what this means. Also I noticed that almost every night I see "creatures" of some sort. They appear to look like "monsters". I don't know if this is supposed to be just a nightmare. The "monster" doesn't really say anything. Once I see it. (Never went to sleep) I would think negatively and do self harm. As if I did something wrong and it wants me to pay. My behavior would act different. I'd get on social media and socialize with my friends. Whenever I do, I am not very nice/kind. More of a jerk. Can anybody please help me understand what this is? It's been happening. For a few weeks now. Probably a month. (Keep in mind I had a bad past and attempted suicide by cutting and pills. So the self-harm isn't really unusual)