Dear @Breman,
Sorry to hear about your brother and your situation. I hope you can find the support you need from here and among your family.
Regarding your questions:
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There is no test to know if the infection is from childhood, but if you are HBsAg positive for more than 6 months it is a chronic infection (not an acute infection). You can test if this is a new infection if you test for anti-HBc IgM. If this is positive, then you have been exposed within the last months.
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These are different mediations for different circumstances, it’s hard to say one is better than the other. This is something you have to talk to your doctor about to see what is right for you.
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There are many reasons why you might have pain there. We have threads talking about this: Upper right quadrant pain; Titling feet and pain on the righ shoulder blade.
Hope this helps,
Thomas