This sounds like a difficult situation, and understand that it may be difficult for you and your family. First, discuss your feelings with your husband. Try to understand the reasons for his anxiety and stress. Explain how his condition is affecting you and your daughter. It is important to emphasise that you want to support each other.
Consider seeing a family therapist with your husband. A professional can help you understand each other better, discuss difficult topics, and develop strategies for managing anxiety. Ask for support from other family members. Perhaps your parents, siblings or close friends can offer help and understanding, creating a more supportive environment.
Help your husband create a stable daily routine that can help reduce stress levels. A healthy diet, regular exercise and adequate sleep can have a positive impact on emotional well-being.
Explain to your daughter that you are working to make family gatherings more comfortable. She may also want to consider seeing a family therapist for individual counselling.