Dreams involving family, vacations, and feelings of loss or disorientation can carry significant meanings. In your dream, there are several key elements that stand out:

1. Family Dynamics: Your dad taking out a mortgage for a vacation suggests a desire for connection and shared experiences. It may reflect your feelings about family obligations or the lengths family members go to for each other.
2. Circus Imagery: A circus often represents a chaotic environment or a place of entertainment that may also conceal deeper issues. The sad animals could symbolize feelings of unhappiness or helplessness within your family or in your own life.
3. Loss and Isolation: Getting lost in the tunnel signifies feelings of confusion or being overwhelmed in your waking life. The dark, twisted place might represent fears or challenges you are currently facing, where you feel unsupported or misunderstood.
4. Communication Breakdown: The struggle to contact your husband and family indicates a fear of disconnect or not being able to reach out for help when you need it. The crying and panic of your family emphasizes how much you value their support but also your concern that they might not understand your struggles.
5. Dying Dolphins: Dolphins often symbolize intelligence, playfulness, and emotional depth. Seeing them in distress can highlight feelings of sadness or loss of joy in your life or relationships.

Overall, this dream may reflect your current emotional state, feelings of isolation, and a need for connection and understanding within your family. It might be beneficial to explore any underlying issues you're facing and consider reaching out to loved ones for support. Additionally, taking time for self-care and reflection could help you navigate these feelings.