Greetings! I would like to start with saying that wat u have told in your above message, it's absolutely normal for any human being to feel so against someone they love. What u are going through is a gesture of love u have over the one u love. There is no need to detach yourself from someone close to u. This s a weird feeling of insecurity, expectation and anxiety caused by a small drift in the physical (presence) constancy of someone who had been with u all along.... this  feeling  shall be taken as a sweet gesture or a self evaluatory technique to assess how much the person mean to u. U could try n make a contact to the person whom u miss.. and rather feel happy about yourself for being genuinely caring and continue your work peacefully. Happiness s a choice. Ve a great day