The early stages of an HIV-infection may include some of the symptoms you mention (herpes breakouts and rashes, for example) but the serological tests and PCR definitely excluded HIV-infection as a cause for your symptoms. AIDS-related syndrome (ARS) is one of the later stages of the HIV infection wherein HIV- blood tests must be positive. In your case, all the HIV-tests were negative.
Herpes simplex virus (HSV) infection is a wide spread and life long infection. HSV can reoccur whenever local immunity decreases, or your immune system weakens. An HIV-infection is only one of many reasons for a decrease in immunity; you focused only on it in your question. Stress and anxiety are the most common reasons for herpes outbreaks. Burning sensations and itching without rash can be also due to anxiety. You might consider consulting a mental health professional or an alternative medical practitioner to learn ways to cope with anxiety and stress.