When you have problems with relations with other people...

[Adonai One]

...and you have that feeling that's like wanting to vomit profusely, what chakra does it stem from?

Wow that is interesting, I noticed that too, not as bad as vomiting though, some kind of nausea where the solarplexus is located.. I have been wondering if I have been picking stuff up from that other person that triggered it?
or if it was some imbalance in myself.
The last time it happened, it felt like someone was attaching me like a squid if that makes sense, reaching out to me, in a sort of clinging way... that individual does have a history with clinging as far as I know.
(and so do I, so I guess the answer is both)

You have brought about key insight, Meerie, and I thank you for it. It appears that these feelings are of the release of control/power. Very primal if not sexual at times. Clinging is a proper word.

I was letting go and/or managing desire it seems in regards to relationships.

Again, my understanding is so limited. These dealings transcend the realm of the mind it seems.