Sounds pretty freakin cool! I'm glad you got where you intended to go.
As for shivering, I have this happen fairly often. If I'm not in a nice warm bed, I often get the shivers. I do think it's mostly a mental thing, though. Physiologically, you may need to shiver, but I know when it happens to me, I'm not really that cold, at least not cold enough to really need to shiver. The last time I had some DMT, I could not stop shivering. So, I indulged my body/brain and shivered as hard as I could. It was interesting. For some reason, introducing my own intention into the shiver waves caused a change in the fractals I was seeing behind closed eyes. Everything became radially symmetrical, forming a mandala. It was pretty sweet.
May you have many more mind blowing journeys!:thumb_up: