My first 48 hours back at home

I have been back in the US for almost 48 hours and I am still feeling exhausted. I did not sleep well on the plane, and although I did not sleep on my way to Argentina either I was able to function normally the whole day with no exception. I guess I am finally suffering a bit the emotional and physical effect of having come and gone for two weeks with my parents, trying to help them with their doctors visits and also with some outings that we did together. I recognize that I am not 20 years any more.
I also feel something that I tend to feel almost every year when I come back and that is that I am not mentally here or there, I am sort in no man’s land. I guess it is part of the drainage of my emotions, and it’s not that I miss the place, the US is my home, and it’s been for 25 years, together with my family. But meeting with friends, although it gives me a tremendous boost at the time, it also drains me emotionally, especially this year as it was the night before my departure. By the time I am on the plane it feels like I’ve been shutting down, first by saying goodbye to my friends, then to my family, and last with a very good friend, who picks me up and takes me back to the airport, although I value his friendship and will never be able to repay all he does for me, it seems it is the last straw that breaks the camel.
I guess with a night or two of proper sleep and going back to my daily activities I will plug myself back into the routine, not that I will completely forget what I have gone through but reminding myself that life goes on. As all these things are in my head I come to appreciate why my mother’s sister and family only came back to Argentina twice in more than 50 years, not that I agree with that idea.