I want to present my case to you. Three years ago, I had a relationship with a person, after one year, I started to have symptoms. I did seven HIV tests in the last six months, and all were negative. However, I still have the following symptoms: sinusitis, swollen and painful lymph nodes, sweating, candidiasis on the nails, heart problems, low lymphocyte levels. I want to ask you, is it possible to have HIV without developing antibodies? What further investigations should I do?