The uncle has been sick for a while.
Your husband is very involved with this right now, and has been for quite a while. Your neediness is something he can't handle right now. The fact that your marriage blew up when it did is no coincidence. Everything happens in God's timing.
I would see this as an opportunity to serve someone else's serious needs. They have asked you to bake some goodies and you say you know how to do it. Use your God-given talents to serve them at this time. Be gracious and kind, unselfish and loving. That will make you feel much better than harping at him during this sad time. This is about how YOU act, not how he acts. It's the only thing over which you have ever had any control.