When my son went away to school, we agreed that he would be the one to call me when he had the time to talk. Its been years and he still calls. Keep up with them on facebook if you can, it's real nice seeing pictures. I am sorry you are going through this and it is difficult. Make some time to do something special for you. You can also start cooking and freezing food because those college kids sure do get hungry!
The best thing is that you will make it through this just fine. Best Wishes....