It's understandable you are feeling freaked out, getting a test you did not expect. There can be many reasons for a low white blood cell count, and so it is good you are addressing it, and I hope you get answers soon. We are not medical professionals but can provide information that may help you. HIV in particular is a condition that impacts CD4 cells (a type of white blood cell) so learning about those may help you in conversation with your doctor - https://h-i-v.net/life-cycle
Like I said, there are all sorts of reasons, but if you or anyone following this thread finds out about an unexpected HIV diagnosis, know that you are not alone and with advanced treatments, there are many here on this site living healthy lives with HIV. Avoid the misinformation that is out there, and come here to ask community members questions! Please let us know how you're doing and how your test goes. I hope you get some answers soon! - Liz (Team Member)