Thank you for sharing your dream experience. Dreams can often reflect our subconscious thoughts and feelings, and your dream about surgery on your back may hold significant meanings, especially considering your current circumstances.

1. Surgery and Vulnerability: The surgery in your dream could symbolize a desire for healing or change. Since it’s occurring on your back, it might represent burdens or responsibilities you’re carrying. The fact that you feel no pain during the surgery may suggest an acceptance of necessary change or transformation in your life, indicating that you may be ready to confront issues without fear.
2. Your Husband's Presence: Your husband's presence in the dream could represent support, but his eventual departure might indicate feelings of abandonment or concern about your relationship. Since you mentioned that you are not facing a separation, this could reflect anxieties about intimacy or worries that he may not fully understand what you are going through, particularly with your health issues.
3. Communication During Surgery: The fact that you and the medical staff are discussing topics unrelated to the surgery might suggest a need for distraction from pain or anxiety in your waking life. It could indicate that you are seeking comfort and normalcy amidst a period of distress or change.
4. Vividness of the Dream: Since this is one of the few vivid dreams you've had recently, it may indicate that your subconscious is processing emotions and thoughts that you've been unable to address while awake, perhaps related to your health and relationship dynamics.

Overall, your dream could be urging you to explore feelings of vulnerability, support, and healing in your life. It might be worthwhile to reflect on your relationship with your husband and consider discussing any concerns or feelings you may have with him. This could foster greater understanding and strengthen your bond as you navigate your health challenges.