Experiencing tightness in your chest, jumping around, and becoming nervous while working is usually the result of tension or anxiety, which may cause your concentration to be muddled and leave you feeling incapacitated. To acknowledge and accept these emotions might be one of the most important things you can do. Try self-help techniques such as meditation or mindfulness to destress your mind. Daily physical exercises and a good diet can make you a happier and clearer person. If they continue to occur and get worse, I recommend you talk to your family doctor who will offer you qualified help and guidance.