It seems you are crossing over into an otherwordly space or having visions. The imagery is very traditional and has mystical significance that you would be served well to investigate further. My thought is that rather than keep dropping into trance unintentionally and getting pulled there at random times. You should focus on learning to go into trance on purpose, and pull yourself out of the trance as well. By learning about trance and what it feels like in and out of it, you may gain more control when the veil drops for you. Although, if being pulled into trance is saving your life, you might not want to stop it entirely!
Is this witchcraft? Yes and no. Witchcraft is a set of practices you could take up now that you have seen a bit of the otherside. However, there are other practices that humans have developed to work with visions and the otherside as well as witchcraft. There is a large variety of mystic traditions, and this reads to me like your first initiatory steps into finding one for yourself.
I think ghosts are just various kinds of spirits that appear to the living. They are specifically spirits of those that used to be living.
There are many types of spirits, of which ghosts are just one kind.
I don’t have much experience with ghosts. The dorms I lived in at University used to be an old convent, and you could hear one of the ghost nuns babbling in the stairwell now and then. Even confirmed atheists agree that there was a ghost talking there. We just accepted her right to be there as we were kinda the young punk interlopers. We left her to her devices and rushed out of the stairway when we heard her.
I checked and May was most interested in faery seer/faery witches as the kind of witch she wants to be. A faery seer can sense faeries and works with them to do their witchcraft, often having a faery familiar.
There are a variety of ways to awaken this sight, from the 17th century practice of stealing corpse hair and watching a funeral procession through your knees to falling asleep on a faery mound, or doing some hedge crossing journeys into the fae realms.
Most books on faery magic will have some such journeys to get you started. I particularly like the holey stone cord rite that I have posted a few times now.