giveitago, you don't indeed seem depressed, muddled may be the word you use, but from here it looks more like confined, constricted.
you can empower your mind. you can literally be where you want to be, who you want to be and with whom you want to be.
All of the stuff keeping you with him is just stuff. Money? don't worry about it, sounds like HE is dragging you down more than supporting you. You could and would do better on your own. The sooner you start, the sooner life will be great.
Why would you want to wait until your kids leave, then how can you leave him alone, you'll be older, less easy to employ, what if something happens to your H which means he can't look after himself, and you are stuck there for llife. He finally dies and you are too old to live the life you have given up waiting to get out.
Sure it's scary, but not half as scary as watching life go by, waiting for death.
Living in Egypt is waiting for death, that was the one thing I learned from that hole is to never ever sit and do nothing again, waiting for it to get better. Egypt is 80 million people now, they have sat there as a civilisation for well over 7000 years waiting for life to get better. Erm, and how is that working for you?
Life starts today, get help, get advice, find out and plan for worst case scenarios. Plan for the worst and hope for the best.
If your nationality is so crap, WTF is he still doing here then? Heathrow is THATAWAY....