What is this???

Ha

Hey guys. So I noticed throughout my relationship with my ex that sometimes when we would start talking about stuff and it would get heated I would start to get light headed, nauseous and I would literally shake. I would just feel different and it felt like this was when a notification from him popped up or I was waiting for a reply. It just happened now. I was waiting to open his message and all those things started to happen but wasn’t experiencing them before.

Do you know what this is? Anxiety? Stress? Panic? Or am I just overthinking? Because this has happened MULTIPLE times.