Oh sweet girl! I am so sorry that you are going through this. These feelings are common with anxiety. You are not alone! I've gone through the same thing at various times in my life. It sounds like you are going through a stressful situation right now which is why the feelings are there. Rather than trying to push them away, try to understand what your body is trying to tell you. Don't push the feelings down, making them worse. Tell your nephew's mom how sad you are to lose him and that you are fearful you'll never see him again. You may cry, but that's ok! Often a good cry will cause you to feel better. Goodbye does not have to be forever, I am sure that you can see him again if you want to! Make a plan with her about how you are going to keep in touch. Skype, letters, etc. Start saving now for a plane or train ticket to see him (depending on where he's going). I know it's so hard when your feelings feel like a mountain that you can't conquer. There are brighter days ahead, take it one step at a time!