Since you posted originally in
Tagalog, I assume you are Filipino. When you were rejected to work in Dubai, you obviously had no symptoms. And coming from that your area, where there is a lot of hepB cases, it is likely that you've had it all your life and only found out now, just like many young people in your situation are discovering.
You only need to be checked once a year (ultrasound and blood tests) if your readings are all normal. Not 3 months as you've said.