Simply forget about your coins. Stop to read any news related and stop to check the price daily or 2-3 times a day. You will have less stress and so less fear of your coins. Do it at least 1 month and you will see. 1 month is nothing in a life. After a month just do your usual stuff once a week, check the rate, read some news, ect, close everything and keep rolling the life.
I do not think that this is the right solution for that. How can person ignore his investment and specially if he is a short term trader, he need to check the price from time to time and take a right decision in a right time. I think best option can be to invest such amount of money that we can easily bare to lose. Through this way I think we can minimize the fear of holding bitcoin or any other altocin.