No, you are not a fool. You're a decent human being. He is also the father of your children. So helping him is not a problem. Let him get well. However, get him a medical checkup. He should not be able to use his bad health to manipulate you. Also, what can you do to find out why he is suffering such huge losses in his business? And is it really so or is it just another drama to keep you tied to him? Find that out also. Tell your elder daughter that dad's not well but you are taking care of it and not to worry, and that it's not her fault, give her extra reassurance. And distract her with unusual treats. But, kids will sense tension, not much you can do about it. Handle that when it happens. Right now you have multiple crises on hand so decide one by one what you are going to do. All the best, my dear.