Im sorry to hear about your symptoms. Now you havent mentioned the type of exposure which you have had, that would give me a better idea as to whether you could have contracted HIV or not but based on diarrhea alone, that is NOT an indication for HIV. The watery diarrhea alone can be due to an infection in the intestines or even due to another disorder like inflammatory bowel disease, this is a condition in which the lining of the bowel wall is inflammed due to an autoimmune process. This would lead to abdominal pain, diarrhea with blood or mucus in the stools, joint pains, muscle aches etc. This would be diagnosed on a colonoscopy and then treated with steroids. The diarrhea which occurs in HIV is either due to the opportunistic infections which occur very late in the course of the disease (usually when you develop full blown AIDS) or in case of early viral illness common with HIV. This doesnt seem to be diarrhea associated with either opportunistic infections or even diarrhea associated with early viral prodome, because the early viral illness lasts for only 7-14 days.
So in short, i think the diarrhea alone does NOT give an indication whether you have HIV or not but it is less likely given the symptoms you have described. But i would be in a better position to give an opinion regarding your chances of HIV if you could give me information as to how you were exposed to HIV. Since your last test was negative, the diarrhea alone isnt enough evidence for an HIV infection.
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