Hi Edward
I'm a Buddhist and your description of a green mist is very similar to what is described as happening in the Bardo states. The states we pass through on our passage from one life to the next.
When you die we are told that five brilliantly bright lights appear to you , red, white, green, blue and yellow. These correspond to the five Buddha families, we are all made up of different ratios of these buddha essences. That is what is happening when someone achieves the Rainbow Body when they die they are transformed into this rainbow of light. If you open up to any of the very bright lights you end up in the Buddha realms which is essentially what Christians would call heaven. If you miss this opportunity you are offered other soft diffuse lights appear, one of them is green and it is associated with the animal realm. ie if you open up towards that you will be reborn as an animal. It is possible to have experiences of these outside of the Bardos and although very rare may have been what you are experiencing. I wouldn't worry about it you still seem to be able to type so assume that didn't happen
Another case involving a green substance which denied forensic examination is the case of Zigmund Adamski
http://www.theparanormalguide.com/bl...amski-part-two