Help me travel to see my son for the last time

Hi, my name is David and this is my son Brian.      Brian is 4 years old and was diagnosed leukemia when he was only 2 years old. He is now in the USA  with his mother going through a medical treatment that we managed to pay thanks to a fundraising we carried in our home country (Argentina).  Besides the fundraising, we sold everything we had for him to be able to access this treatment. Unfortunately, things went wrong for Brian and doctors expect him to live not more than 3 months.  I am desperate because I need to travel to the USA to see my child for the last time but I have no money at all nor do I have too much time to wait . Like I said, everything we had was sold so that we could pay for a treatment for him.  Every little donation will help me re-unite with Brian before he goes away.  Thank you,  David.