1 - I would like to think we can still stay conscious after we die. I imagine it to look similar to what we see when we dream or daydream. It's not solid like the body, but it is wavy and liquid like pure energy. There is no pain there because pain only exists in this physical universe. You can do anything there; there are no mechanical restrictions such as gravity, like there are here. There may be some other form of limits, but not material ones.
2 - From all the things i've read and experienced, i've used logic and my imagination to formulate this opinion. It's a very limited perspective really when you consider how large the multiverse is and how small i am.
3) Out of body experience yes! When i was on drugs i used to get them when i tried to sleep - i would feel elevated from my body and i could see into other dimensions, but it didn't last very long. It was a pretty strange side effect of the drugs.
If you want to hear OOB experiences, look up Cory Herter.
4) Only in my imagination with my eyes closed, not outside of my mind.
Lastly - Imagine if this right here right now IS the afterlife. We all died in the REAL world, and this universe here is the Afterlife. I read this belief somewhere before; when we die here we are born in the spirit world. When we die there we are reborn here. I like that idea.
