Please know that you are doing right by your daughters by telling them "no". Believe me, I have seen far too many parents let the crying get the children their way. By giving into the crying they are actually harming the kid instead of helping him to learn. Such children grow up miserable because their parents, by not exerting external controls while the children were young, never taught them how to develop internal controls.
Sorry to hear your little ones are sick. It's no picnic.
While I know that it is right it doesn't make it easier on me right now. I keep telling hubby that we will be glad we did when they are thirteen and older, they're now three and 20 months. Still, making those tough calls which is necessary because of Original Sin, is harder on me than labor. And that's how I read Genesis.
On the other hand, I know that they find security in boundaries.
forgot to add...thank you for the cybersupport. In the day of the overindulgent parent, I often feel alone and like the big bad guy...I appreciate your words of encouragement.