According to the data you provided (middle chest pain in May 2009, positive test for Hellicobacter pylori, taken antibiotic and probiotic treatment, stools vary from very long, to very loose), you might experiencing Irritable bowel syndrome (IBS) that accompanied the gastritis (inflammation of the stomach). The gastritis is probably caused by the Helicobacter pylori which need to be treated with a certain therapy which you are already taking.
The nausea and the slight pressure in the abdomen might be related to IBS. There are many reasons for IBS.
You might want to visit a specialist in gastrointestinal disorders for a physical examination. A stool culture might be asked for in order to check for presence of bacteria and to detect the most effective antibiotic which would be able to treat the existing intestinal infection.
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