Dreams involving family members, health issues, and feelings of stress can often reflect your subconscious worries and emotions in your waking life. Here’s a possible interpretation of your dream:

1. Concerns for Loved Ones: Your grandpa's health issues in the dream may symbolize your anxiety about the health of family members or the inevitability of aging and illness. It suggests that you have a deep care for your family and may be feeling overwhelmed by their vulnerabilities.
2. Feeling Out of Control: The stress you felt about your grandpa's health and the reluctance of your family to seek help could represent feelings of helplessness in your life. You may be encountering situations where you feel like you need to advocate for someone or something, but others are resistant to change.
3. Ex and Change: Your ex's appearance and newfound happiness might indicate that you are processing changes in past relationships. His acceptance of his identity could reflect your own journey toward understanding and accepting various aspects of yourself or those around you.
4. Health Issues and Vulnerability: Your own health concerns in the dream, particularly being immunocompromised and the mention of potential surgery, might symbolize feelings of vulnerability in your life. This could relate to physical health, emotional well-being, or uncertainty about the future.
5. Loopy and Carefree Feeling: The state of being loopy and carefree might signal a desire to escape your stressors and find relief from overwhelming responsibilities. It could also suggest a need to take life less seriously or to find joy amidst chaos.

Overall, this dream reflects a complex mix of concern for family, personal vulnerabilities, and the processing of change and acceptance. It might be beneficial to take some time for self-reflection regarding your health and your relationships with your family and loved ones. If these themes resonate strongly, consider discussing them with someone you trust or a professional who can provide support.