<human>: Can you succinctly summarize the text in 1-3 sentences?

My heart is pounding and I am taking small fast breaths. I am shaking uncontrollably and feel weak in my limbs. I dry vomited on and off all day. I am familiar with this anxious feeling but never so bad..

We ended horribly. He cheated on me and never apologised, he always one-upped me if I ever said I was upset, he was depressed but never sought help and decided to wallow and blame the world, and in the end he decided to go overseas to study for a five year degree and leaving me behind without involving me in the decision process of him going away. And when I broke up with him, he blamed it on me "cheating" on him and the distance - not everything that happened. Needless to say this enrages me and I used to shake with anger when I think of all this.. But I've calmed down for a while now, but this time, it's all coming back to me and my body is reacting so strongly it's scaring me. Is there anything I should look into????

Please note: I have made all the necessary preparations in meeting him again (what I want out of it, what to say, managing expectations, having a friend be nearby in case shit goes bad) this is only about my physical reaction to all this because I don't know how to deal with it or why it is happening.
<bot>: I feel extremely sick in anticipation meeting my ex of a decade long unhealthy relationship that ended with him blaming everything on me. What is wrong with me I feel so sick.