You would have to speak to a lawyer in China........

You can ask for a refund. Maybe some coupons.

I am not sure what your question is, but if you are asking if you have grounds for a lawsuit IMO you do not. 2 days of pain, no matter how severe,...

You can certainly speak to local injury attorney, but I think the fact that you didn't check the sandwich is going to be a big hurdle against you....

This is a general Q&A forum. You will need to contact lawyers on your own. You can use the Find a Lawyer tab above.

Can you sue? yes Will you win? No Why? You suffered no damages outside of being grossed out, and there is no way to prove anything.

Who you date is up to your parents, not lawyers.

A judge will decide whether it was a gift or a loan.

What you are really asking is if you sue them, will you win? None of us can predict that. A protective order is a much better way to go IMO.

This is a general Q&A site. No one here can check your name.