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.
To root out your fears you have to learn and understand about the rise and fall in bitcoin prices so you can predict though not very accurate but that could be the foundation you can use to eliminate fear. You should also pay attention to the bitcoin market and always listen to the latest news about bitcoin so you can see your future plans.