Do symptoms come all at once if you have hiv? Typically how is it seen with symptom?

No, not necessarily. It really depends on the person. Some people when infected with HIV may have very nonspecific symptoms of an acute HIV infection (fever, rash, sore throat, fatigue, body aches) which may feel like a bad flu. However, many people have no symptoms at all and do not know they are hiv-infected until their immune system declines and they eventually get an infection suspicious for HIV infection.