Wow.. you did shoulder a heavy burden... Your situation kinda similiar with mine
I have a burden too.. my parents was retired already, i was separated with a child and my ex husband has no responsibility if paying for our child support, instead he left us some debts.. but fortunately I still have savings and still have jobs.. Sometimes my salary is enough, sometimes there's a sudden expenses like medical expenses, my brother tution fees, etc that keeps reducing my savings..
Please don't relay to human(especially man), human sometimes cannot keeps their words & promises. But GOD is good, he won't let you a burden that exceed your capability..
Like me, now Im trying to be more independent, even tough sometimes Im sad when I saw how my ex was very irresponsible, my friends are drifted away because now I rarely going out with them, sometimes when I'm soo down, I will start thinking what if I go seek rich man (I hv a nice face, people said) and married off.. But of course that is silly, i wont marry someone based from his economical status, my marriage is broken because i didnt married a good man and now Im not so interested to start a relationship anymore. Love could strengthen us, but also could weaken us we we choose the wrong man.
Happiness is comes within our hearts first, this Bible verse keeps me away from bitterness: "Proverbs 17:22 A joyful hearts is good medicine.."
So everytime I feel sad & feeling my burden is heavy, I always remember this verse.. To keep happy,. no matter what happen don't let people see how sad & misrable you are. Keep thankful to God he wont let me carry a too heavy burden but he trains me and shape me into a stronger person & more independent.
Dont let your situation drags you down... There is Ups & down in our life, Im praying that you will pass it soon... I hope you could solve your problem.. be happy & thankful..