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HBsAg + denotes acute HBV hepatitis
. It may occur before icterus is clinically evident. Persistence beyond 6 months defines a carrier. Anti-HBsAg - rises once the acute disease is over and convalescence has started. These two indicates you are a carrier.
This can also happen with vaccination
. I can not estimate the duration of the disease.
Regarding treatment options, there are certain indications. Viral DNA should be >20,000 IU/ml+ ALT should be elevated or id you have liver biopsy
there should be significant histological disease.
HBeAg negative indicates you are infective and virus is not replicating.
Regards Dr. Jagdish