Dearest Stefanie... may you have peace... and I apologize for the dear folks here: they're pretty angry. They've been through a lot, most of them, severely lied to and wickedly enslaved... and one "coping" tool that you'll see here quite often is sarcasm. From time to time you will also witness rudeness, and on occasion downright meaness. But, they have somewhat legit reasons to be this way, truly, and many are working to overcome it. Most are succeeding.
Now, for your question: yes, there are demons; they do indeed exist. But not just as you think. You see, demons... is the English word for "daemon"... which means "spirit". So, there are "good" daemons... as well as "bad" daemons. The "pagan" equivalent would be "fairies"... you know, good and bad beings... with wings. Fairies are just smaller... and fulfill a need to understand the spirit world... without buying religion's take on it.
But... spirits... good and bad... do exist. You have nothing to fear, however, as NONE of them... good or bad... can do anything to you... or for you... that you don't ALLOW. They only "power" such ones have is that which we give them. Thus, you must let a "good" spirit help you, if you need it to; otherwise, you are resisting and receive no help at all, for if you oppose, it cannot do that which you've asked for. Constrastly, if you oppose a "bad" spirit... it will move on. Why? Because, as I said, they have no power of their own over you; they are impotent against flesh, unless flesh "allows place" for them... good or bad.
Spirit beings exist, in the spirit realm... just as flesh with its blood exists in the physical realm. ANd one thing that "bad" spirits will do is attempt to frighten you... such as what you experienced. Why is this? Tell me, what is it that makes another have power over you? Isn't it your fear of such one, that as long as YOU are in fear of HIM, HE is in charge? But once you get past such fear, any perceived power is... well, nonexistent? With on exception, of course.
But religion has played a BIG role in perpetuating such fear; they are, in fact, "agents" to that end. They have taught you that what is bad is good... and what is good, is bad. For instance, in what spirits truly look like. Trust me, they are NOT the tall good-looking menlike creatures we see depicted in religious art. THAT, dear one... is the flesh of earthling man, which spirit beings can put on and off, in order to appear in this realm... and return to the spirit one. But it is NOT what they themselves look like. They... are all seraphs... "flying fiery winged serpents"... or... dragons. Thus, even God "breathes fire" from His nostrils.
We have been TAUGHT, however, BY religion... to abhor that type of creature... in fact, if possible, to SLAY such ones. But there is only one, Satan, the arkaic dragon... and those who 'belong' to him... who is to be "slayed"... or rather, cast into the Lake of Fire (which is the only thing that can destroy a spirit - the flesh dies, true, but the spirit must be destroyed and only "celestial" fire can do that).
All spirit beings, then, all 'daemons', although they LOOK like they do (and since they are the same 'species', yes, they all look pretty much alike, like humans look alike...), are not "bad"... are not wicked. You know, like humans: the bad don't look any different from the good... on the OUTSIDE. The same is true of spirit beings.
Please... don't worry yourself too much that you were visited; you may be again. Whatever the purpose, you have no reason to fear: neither good nor bad spirits can do to you more than you permit... excluding that which God might permit (i.e., see Job). But Job proved Satan a liar... as did Christ... that all a man has he will give in behalf of his own skin... and unless you have PROFESSED that you are a son of God, by means of being joined to Christ, having been baptized by HIM... in SPIRIT... and live by means of HIS flesh and blood... you are not greatly subject to such tests. Why? Because it is only with the seed of the Woman... the sons of God by means of God's spirit... holy spirit... that Satan is now 'waging war'; it is only they who now have to answer the accusation as to what we will "give" in behalf of our own skin, as "the accuser of OUR BROTHERS" has been hurled down among us. And we are not afraid, because he "has NO hold" on us, for he has no hold on our Leader, Christ.
Demons, however, really only play "games"... just as what happened with you... to see if they can TRICK you into fear. They did that time, but don't give in to it anymore. They're pretty pitiful, really, in their games and if you recognize this, you will find hard to be in fear, because it's hard to fear those you have... well... pity and disregard for.
I hope this helps.
A slave of Christ,
SJ