It is good to express the way you feel, but do not make a habit of throwing yourself a pity party every other day. This will only make you feel worse and send you into a mild depression. Continue going about your daily routine and stay busy. When you stay busy your days go fast and you do not have time to mope. Focus on the positive aspects of the relationship and be confident that the relationship will survive.
Communication is vital in keeping the gap close.
Let the other know how you are feeling. This could be done by phone or through mail. Keep a journal or diary and then once a week read some of the entries. This will keep your significant other informed on what is going on. The worst thing that a couple can do is not communicate with each other.