Hey there FDM
Tell her you want a divorce...

that'll shut her up...Or just book a ticket and go see your family.
I am so sorry you are having to go through this terrible situation. You really do have my sympathy. For someone to embarrass you this way is ugly. Maybe she needs medication of her own? I can see how it would be depressing and causing you much anxiety.
I have a beautiful friend who's brother is in this same situation and he can do nothing right though he has supplied a beautiful home, the wife doesn't need to work, she gets anything she wants and yet she is still not happy. My friend worries for her brother who has had cancer at least twice and should be being cared for not being given what for!
I think the whole reason for their unhappiness is that they are in an arranged marriage and he never wanted to marry her but his uncle went off the deep end and forced the marriage (I could really snot him one), so he ended up marrying her so that she wouldn't feel slighted after they met for the first time

. Though culture should be respected it shouldn't be forced on the younger generations when they have become more cosmopolitan in their thinking and lifestyle.
I really hope you can just stand toe to toe with her and tell her it stops or the marriage stops...get a bit of Lion power and some tiger in your tank and just tell her what for,
Loving thoughts,
Rhia