Reading your post, it is clear how difficult a time you are going through. I think that, as a mother, the way you are single-handedly taking care of your children and running your business while coping with your own physical and mental illness is really a matter of patience. Sometimes I even surprise my wife. She has given mothers so much patience. Also, the way you are patient despite spending so much money on your son's treatment and your own illness is admirable. You need to take care of yourself and maintain small habits like drinking enough water, even for the sake of your children. It is difficult to handle all situations alone, so seek professional help quickly. I hope this difficult time will pass for you and you will regain peace of mind, inshaallah. Best wishes to you and your children.