Hi Please Provide Some Closure. I Recently Took An HIV

Hi please provide some closure. I recently took an HIV test after discovering that my husband had been cheating on me. He's the only man I've been with and my last sexual contact with him was in the beginning of July 2016. Anyhow, I took the HIV test in mid August, the results came back reactive. My doctor then sent the same sample for confirmatory testing via qualitative RNA. Those results came back negative. My doctor told me that I am therefore negative and the initial screening was a false positive. She then asked that I come back in one month to retest. So I went back in mid September, and again the results were reactive. So she did the same thing and sent the sample for confirmatory testing and again they were negative. Even though she says I'm negative I'm still so unsure. For this reason I went to see an infectious disease specialist who also said my confirmatory tests are accurate and I'm negative. I can't understand why the initial screenings keep coming up as reactive. Please help! I'm freaking out.