Acute chest pain + shortness of breath.

I usually work in night shifts although these days I'm not working and this has happened to me for the first time. Today when I woke in the evening I had acute chest pain right in the centre and nauseatic. I got freshen up and had my tea. All this while the pain and nausea was still happening. After my tea I went to the washroom and just when I sat on the toilet seat and got up my heart rate started increasing. I came out and started feeling anxious, restlessness and suddenly I could barely breathe from my nose and started crying. It seemed like I m short of breath. It happened for few minutes. I kept checking my bp all through this while and the sugar test too. Both of them are normal but my heart rate kept revolving around 95,94,97. After few minutes I got breath back and went to rest. Almost am hour later after rest I'm still feeling a little pain in my chest. Can you tell me what happened?