When I'm facing an illness, I always turn to Louise Hay's "You Can Heal Your Life" for ideas on the spiritual meaning associated with the symptoms, along with affirmations to meditate on. It doesn't always correlate, but it frequently does and it certainly offers a starting point to think about.
Heart problems: longstanding emotional problems. lack of joy. belief in strain and stress. "Joy. Joy. Joy. I lovingly allow joy to flow through my mind and body and experience."
Breathing problems: fear or refusal to take life in fully. Not feeling the right to take up space or even exist at times. "It is my birthright to live fully and freely. I am worth loving. I now choose to live life fully."
Now, even more important, I'm looking at what you wrote when you were sobbing. "oh my god I've been wasting my life, etc."
There may lie your answer. It sounds to me like you are do for a life overhaul. Aka: midlife crisis. How have you been wasting your life? What would you have done differently? What can you do now, and from now on, to make your life "not a waste?" If you had 6 months to live and money was not an object, what would you spend that 6 months doing? These are questions to meditate on. BTW, don't expect to "hear" the answer during the meditation. That just focuses your intent. The answers will pop up later, unexpectedly. 
It goes hand-in-hand with what the others wrote, btw. Menopause ain't called "The Change" for no reason, lol. Your life, its role and purpose, are fundamentally changing.
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