I do recognize this feeling. There's a kind of borderline when I'm spending time with some people. My mother is one of them. Perhaps the first. Some boyfriends were too.
There's a moment when I feel that I've had enough of them for now. And a realisation that I can't just tell them to leave. Or that they won't leave anyway (the mother). So there's a bit of spontaneous mental effort applied and my mental state changes to a very passive and dependent, aka clingy. From that moment I just want them to stay and do whatever. Often that's connected to feeling of nausea and/or headache, probably as it's often happening in a setting where I haven't been outside for the whole day.
Last time when I was with a guy and feeling that moment coming I told him to leave. He didn't. I told him again, he didn't. I got up and made my point but it was too late. But I managed to keep the facade. He didn't see it. But after he left I collapsed emotionally. If only he left half an hour earlier I'd be an independent energetic woman, full of plans for the remaining part of the day. Instead I've spent the rest of it in the abyss of being terrified that I've rejected him and that he may not come back. And I felt resentment towards him. I felt.. used.
What is this feeling/feelings?!