Butterfly – I don’t see this as a warning about your health – at least not the health of your body, but maybe about your inner health, which is possible to heal. See
http://dreamhawk.com/inner-life/inner-world/#MakesInner Your left leg, if you are right handed, indicated that your less dominant or less conscious motivation, the emotional and physical strength you use to get about in life, has been hit badly. For many people they have memories of cancer meaning a death sentence because in the past there was no certainty of a cure – but that is not so today.
But in the dream you are facing a great and major change in your life – symbolised by death, a psychological event, not physical. What that means is that you have outgrown your old beliefs and views, as you said, “I take every day as they come with no future plans (after marriage and kid’s I thought this is the best way to see things as I’ve been very disappointed in the past).”
Disappointment equals learning through experience, so you were ready for a big change, the death of the old you and the start of a new you – you have done it all before when you left childhood behind and started the new life as a young adult. I believe the pain you felt about marriage was caused by the views, dreams, and hopes that you inherited from your culture, and uprooting those crazy fantasies is painful, like tearing bits out of you.
I see the part where you have to choose the three groups is a natural part of becoming more mature. As we mature we have to make difficult choices. A son told me that he had to fire someone in his business, he said it was very difficult to do. In your case, the change you are passing through, is about deciding who in your life are worth treasuring as friends, and who to sack – an important decision.
The woman who you are uncertain about I suggest forgiving her if you can, forgive but do not forget.
Tony