Stomach doing flip flops?

[Blazewind]

So... a few nights ago, I was attempting to project, and while I still did not fully succeed, I did feel some pretty strong pre-exit symptoms.  I was really drifting into a sort of unawareness, when suddenly I began to feel vibrations.  I felt a definite sense of detachment form the physical world, and it seemed like my awareness was kind of shifting.  Oddly though, at one point it felt like my stomach was doing flip flops.  it was pretty much a feeling that I would associate with motion sickness.  It was that feeling I know can be common while going down on an elevator.  Or... even more accurate, the feeling one would likely get while going over the downward drop on a roller coaster.  I am familiar with many of the things that may occur during pre-exits, but I've never heard about this. I can't tell if that's something to do with a possible pre-exit, or it my stomach did that because I might have been starting to become a bit panicked.  Anyone have any advice about this one? 
Thanks guys. 

[Steel Hawk]

I've felt it. I think it's described somewhere in loosening exercises, it can be felt going any direction, up, down, left, right, back and forth. You should be able to control it, try shifting it side to side, then back to up and down.

[loppoppy]

like many exit symptoms that people worry about on this forum, this is another one that can occur during a projection attempt and is nothing to worry about =). The advice i can give is if you feel it again don't let it distract you and continue to relax and focus or like steel hawk suggested while i was typing this response attempt to control it so it does not continue to bother you or distract you. your doing well =).

One reason for these strong exit symptoms may be because you have not properly opened your chakras and it is making it more difficult for your astral body to be released hence the strong sensation. I assume you know what chakras are and such..?

on a side note a simple way to answer if it was because you were panicking or not is if you thought you were panicking or worried about anything whilst this was happening =)

[Psan]

Or... even more accurate, the feeling one would likely get while going over the downward drop on a roller coaster. 

Sounds like an activated energy center near the naval.
These sensations are so new to our brains that it interprets them wrongly most of the time.