Change to my inner landscape - Birth of Shamanism?

[StormNexus]

There is no Shamanism category in the forum, so I have chosen to post this here. I have recently been strongly drawn toward shamanism. I'm not at all familiar with it other than some basic concepts. I picture elderly wise men or women drumming, chanting and hallucinating around a campfire - travelling to otherworldly realms to explore and battle evil spirits. I know they learn about plant medicine from the plants themselves - communicating with them directly.

I have recently experienced a dramatic and (initially fearful) shift in my "inner landscape" as I've called it for years. This is a personal place I go to in my mind during meditations. It is an island I created for quiet space and somewhere I can go to speak with my angels, guides, guardians, and ancestors.

Original state of inner landscape (5+ years of stability):
Forested island with sand beaches. In the center, a small cabin surrounded by gardens and garden paths. Within the cabin were several rooms and areas that I used for specific self-improvement work and communication with certain ancestors and guides. I created this space and it has been constant for years - I was in complete control of this place as its creator.

Recent change to my inner landscape:
I came to my island and there was an absence there - something I can only describe as part of my soul missing. This represented itself as an earthquake and distant rumbling. Much of my island was being consumed by this emptiness and ripped away into the ground "behind" the cabin. I entered the cabin and found several of my guides inside in a state of confusion and a couple of them in fear of what was happening. They may have been reflecting my own feelings. This was my literal sanctuary being ripped away. I called in an army of angels and helpers to stabilize the island. One of my guides, a crystal dragon, took on a new form as a humanoid for the first time and worked with me in-lock step as I willed the island to stabilize. I subconsciously knew the only way to stabilize the destruction was to dive into the heart of the void opening up. I walked through the back of the cabin wall, now missing, and jumped into a gaping tear in space-time, resembling a deep, black canyon.

I fell/flew through this opening into outer space. I subconsciously knew that I needed to create something huge - something solid - to end the destruction. I created a planet. I willed a planet divided into 12 giant continents to form in space. I seeded this planet with 2 ancient races whose purpose is to terraform the plants and animals of the land and sea. Once done, I returned to my partially destroyed island with my dragon guide. My guides were all more content and peaceful now. The destruction has stopped. My cabin was being rebuilt into a castle, of sorts. The foundation of my new dwelling was replaced by a large twisting tree-stump-base with thick roots. The castle is hazy and indistinct, as if I cannot bring it fully into being yet. I've never had so little control in my own inner space, and yet done so much here. Yet, I was able to create a balcony and stabilize the gaping maw into the void that now dwells beyond my castle.

Why am I posting this vision/experience with regard to shamanism?
I have a strong connection to earth, nature, trees, etc. I have done this planet creation thing before - in fact I have memories from past lives creating solar systems and planets just as I did in this vision.

If you have performed shamanic visions, quests, or travel to lower or upper realms as I believe they're called... what is it like? Is it similar or different to what I've described?

This morning I played shamanic drumming in my headset to travel back to this planet I created. It was thriving. I found myself traveling through a world-tree to this planet, then again through the tree to a lower realm of the planet I created. The lower realm of the planet that I created was desolate and looked like a lava planet. I began creating life here where there was none. Starting with small plants, grasses and shrubs - I then called rains to cool and flood the lava. The steam fed the clouds and rain. I seeded a "great seed" there, which will grow into a world tree. I felt then saw a dark presence above and behind me - it was a black dragon. It was fire breathing and I simply transformed all fire into breaths of fresh air. I easily neutralized the dragon here with my redwood staff. We had a conversation and ultimately came to an agreement on its position in this world. I returned through a new world tree that just sprouted to the surface world there. I proceeded to create a half-dozen life-forms in pairs of male-female on each continent. I gave them each some minor direction and a gift. I then returned to my inner landscape through a worldtree to a grove near my castle. After this journey, I feel at peace and more connected to that planet. This felt shamanic to me and why I posted it here.

Thank you if you've made it this far. I'm open to any books, websites, and advice you have for whatever this is that's happening to me.

Blessings