I am so sorry to hear about your mom's diagnosis. I know how difficult this must be for you.
If your mom has been a U.S. resident her whole life, she should be able to apply for Medicare. If she has held a job...she may qualify for social security or disability. Perhaps trying to find an immigration lawyer who would take on her case pro-bono?
For yourself...practice self help...and try to find a support group for caregivers as an outlet for your worries.
We are here for you as well...
Sending prayers for you both.
"Courage is not the abscence of fear, it is feeling afraid and doing it anyway!"
"Worrying does not empty tomorrow of its troubles...it empties today of its strength."
Corrie Ten Boom
Panic Syndrome recovery due to CBT