This a basically a very important question and the fact is that,since it depends upon so many factors,that the direct and straightforward answer is very difficult.
The out look regarding prognosis of HIV
was very bad in 1980s when many people used to die from it but since the advent of HARRT therapy ( HIGHLY ACTIVE ANTIRETROVIRAL THERAPY ),the outlook and prognosis of HIV/AIDS
has changed tremendously.
If the patient has not developed AIDS or if his immune system is not damaged ,then with proper treatment a person can live a normal span of life.
Keep taking the treatment and your treatment is right and you have to take treatment life long.