My first experience about anxiety

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Hi guys I'm a newbie. So 3 days ago my anxiety started again. First I experience it was in 10th grade. I didn't know what that feeling was so I shoved it away. But know that I'm a bio student I understand it.

My first relationship was a total waste and after the break up I had experience anxiety whenever I saw him that feeling was strong and I just thought that I was a fool to feel about him but it was actually anxiety. After that I really didn't get along with any one. Please let me know if that was really anxiety because the symptoms where same chest tightness,short breathe,nausea,etc.