I just thought I'd offer a word of encouragement- My husband was diagnosed with stage 4 non-Hodgkin's Lymphoma in 2011, has been in remission for 7 years and has never been healthier. He cycles about 500 km a week, including his commute to and from work, and when the weather is fine he cycles up mountains with his friends for fun! (!!!!crazy, I know!) One of the things I have learned is that there are many different types of cancer, which have many different health implications, and many different individual responses to it. You've had a hellish three years, so I can understand your mindset, but your sister will not necessarily follow the same trajectory as the other family members you have lost. It may be helpful to get some professional advice about dealing with the amount of stress you are under- I found conselling gave me additional coping tools that are still useful today. Your GP may be a good place to start, particularly if you are vomiting regularly. I wish you many, many good things. love and hugs, Emily
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