And welcome to graduate students!
All graduate students get either teaching assistantship(~95% at the beginning) or research assistantship which includes fee waive and stipend. They don't need to worry about economic problems. You can have American standard life (with your family). Some are even able to save some money from the stipend- thats great.
My friend Nabin has written on his blog that approximately there are 25 new comers in physics. And in chemistry about 30. I have talked to some of them to make approximation. How many in mathematics? Some body from the same subject can tell. Some are from geology, agriculture & veterinary, engineering etc. This number is huge number from a country like Nepal. We have only Tribhuvan University to produce Masters in almost all science streams. In case of chemistry intake every year is 90. This year ~30 came to US and others in other countries for M.S or PhD. So about 40-50% go abroad every year.
You have got new life in a sense and it is challenging as well. Any you made it. Congratulations! to all of you and welcome once again. I wish all the best to everyone in future.