FMLA without pay.

This is my mom and dad.  My mom was  diagnosed with terminal brain cancer.  Since her surgery she has gone downhill.  I have flown to Florida a couple of times to help my dad and be there for her. I need to be there not only to support my parents during this difficult time but I am also the only child so I need to be there.  I have exhausted all of my vacation time.  I now need to get back there due to her prognosis and her expected time frame.  I need to get there ASAP, however if I go out on FMLA I will not have a paycheck.  I need the money to help support my family and to prevent losing everything. Without a paycheck I cannot pay my bills and my mortgage. If I can't get there my dad will not only be going thru this alone but I will not get another chance to tell my mom I love her and she was the best mom anyone could ever have. I too am a 2 time best cancer survivor and my mom was with me every step of the way. So I need to be there for her now.
Please help us and please pray for my family during this very difficult time.