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What causes extreme pain in right mid-back area and right side and abdomen? - mid back pain more condition_symptoms

I am a woman of 55 years. I have had the cornary heart disease, severe hypertension, myocardial infarction, 2 children and 2 aunts. In the last week I have a pain in my right in the middle of the recovery zone, and the right side of the abdomen and areas area.When directly under my right rib cage I take a deep breath feels like a sharp knife is twisted is inside. I had two large red areas on his back in the same region last week, it seemed a way of biting. They were very itchy at first, then began to ache. Now go away, but that's where the pain intensified and began and extended to my sides and the area under my right rib is cage.it very painful, especially when I breathe. I have not had any cold, cough or something in a long time.