Are you an over-nervous person?

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I would like to know if anyone had this kind of experience before? I can hardly sleep and my heart was beating very fast (keep thinking about next day) before the deadline of an assignment, exams or the day results are out.... Sometimes I'll get very nervous and start panicking over a small matter. There's a time where I cant find my wallet (it's in my bag) and I thought I left it in the bus. I actually wanted to start chasing after the bus but my friend stopped me and asked me to double check my bag. Any solutions on how to overcome this behaviour or how to stay calm?