Talk to Psychiatry on Anxiety Issue

 I study in USA. Whenever I come to visit my parents in Pakistan I get weird type of anxiety. I can't sleep at night. I get millions of thoughts running in my mind making me restless. I love my parents a lot. I love my younger brother like he is very young. Now the problem is they all love me so much, my parents can do anything for me. I am doing this for a better future. This is what my parents want too. But when they get emotional they ask me to stay. At night, I usually think what will I do, if God forbids I lose them. I will probably go crazy. This thought never let me sleep. Please suggest me how should I enjoy the present and forget about future.