The first time i was diagnosed with cancer i decided i was going "to stay positive". It was a complete burden and totally unrealistic in my opinion. Although i do believe we need to be healthy in our outlooks and that includes not focussing on the bad too much, but i prefer to use the term "visiting" those feelings. Visit but dont stay there and as vinouche has said, it is natural and normal to feel sad when you have something to feel sad about. These days i also just try really hard to just focus on today and cross bridges when i need to. Not always easy but it is doable. So in answer to one of your questions, yes it is ok and it is something i do when things get on top of me as they do.
Julie
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