Woah that's really messed up. I can understand how horrible that felt and the days afterwards when this dream still haunted you.
So many things caught my attention and my thoughts are just all over the place now. I will start with the timing.
Weird or too real dreams on samhein (Halloween) night are rarely just dreams and shouldn't be underestimated. Samhein is the most powerful day in the year, the day when we are the closest to the spiritual world and the day when the veil between our world and the world of death is the thinnest. It's really magical night. For the pagans samhain was the end of the year, not 31. December. After the samhain came period of darkness. So these dreams really aren't coincidence, especially the kind of dream which you had.
Sadly, I dont know why you felt like that before the samhain. And I already explained why you felt like that on samhain. And about Christmas, Christmas = yule. Yule is the time when darkness and evil spirits wander and lurk outside. Though you have to have very strong natural talent for these things since you were able to feel it, I'm awed, that's really something, you have my admiration
About the dream I dont really know what it was. Maybe because you are on this thread (focusing on this stuff and bts) + samhain + your natural talent = you unconsciously channeled on (this is tricky I dont know much about channelling since I dont do it) on the person to whom this was happening (since you saw it as if it was happening to you). Maybe you just somehow channeled and saw this situation. Maybe you just saw something that already happened. Maybe you saw something that's going to happen. Maybe you are medium (and the reason why you felt the samhain and yule is because you felt the spirits) and you connected with someone who is already death and to whom this happened. Maybe it was some kind of seeing of what is actually happened but in metaphorical way. There is lot of possibilities and only you can know which one it is based on your other experiences.
This question will sound weird but did you eat apples before you went to sleep? Or maybe did you have apples in your room when you were sleeping? I know weird
but apples are very closely associated with samhain and I know there are some spells with apples (for example putting apple under your pillow) which encourages prophetic dreams on samhain, so maybe this could trigger this dream as well.
By the crying goat you mean jk or an actual goat? There is so much nicknames on this thread and I'm so lost
About the part about eating heart. Some time ago I wrote about the blood magic and shared video with scientific explanation why it works. When I was writing I remembered that song by k*ty p*rry 'never really over' in the music video she was drinking/eating (?) Human hearts, I thought it was just a metaphor for blood magic but maybe it was literal, though it's very unlikely but maybe there is some way (I didnt study medicine so I dont know). Maybe if you somehow got rid of most of the blood (because blood is toxic to consume in higher amounts). But maybe this part in your dream about eating a heart was a metaphor. And if it wasnt, the blood is really the strongest material, the strongest fuel for magic, I cant stress enough how strong it is. Heart, the organ which pumps the blood - eating it in some ritual could be very powerful kick and whats the better timing for such a ritual than samhain.
I will go back to your natural talent and end this with small advice/warning. If you really have such a strong talent, then you should either "barricade" yourself as much as possible or try to learn how to work with it. By barricade I mean protect yourself as much as possible with maybe some protection symbols, herbs, crystals- what suits you best, there is so much options. Maybe you already attracted some bad spirit/entity/creature, maybe you didnt but if this will keep on happening you surely will. I was unfortunate enough that I attracted something the first time I had this kind of dream (and I dont even have such a strong talent like you) and it took me about year to learn how to force it out of my head/dream. I just one night saw this weird dark thing standing near my bad and it was watching me, afterwards I started having so insane horrible nightmares I cant even describe how dark and horrible those dreams were, sometimes I saw this thing near my bad again afterwards I woke up. After I learned to force it out of my dreams I surrounded myself by all kinds of protection from these things and it doesnt happen to me anymore, though those dreams I had still haunts me even though it's been years since it happened, it's hard to forget these things. So just be careful, these dark things will cling to you like leechesif you won't protect yourself.