Fidyah for missed fasts

Q: I miss 7 fasts every year in Ramadan due to periods. I did keep some qaza fasts but I don't remember how many. I had the intention to keep all but my health was always weak. Now also, I have excess bleeding and weakness due to which I dont think I can keep fasts. I calculated the missed fasts to be 7×30 years = 210 fasts approximately

1. How much fidya or kaffara do I have to give?

2. Can I give all at once?

3. To whom can I give it? Can I give to Rohingya refugees?

Changing one's oath

Q: I have made a niyat to Allah Ta'ala and now I am unable to stick to it. I want to make some changes in that niyat. Is it possible to do so? I have heard that Sahaabah (Companions of Nabi Muhammad sallallahu alaihi wasallam)) sometime in their lives broke kasams or niyat and paid kafaraah. May Allah Ta'ala forgive me if I am wrong, let me know if there is any way so tht I can change my niyat and make things easy for me.

Preparing more than one dish of food

Q:

1. Is it an authentic statement in Islam that, if we eat with more than 2 items of food, we have to feed a guest or guests?

2. If anybody cooks and eats with more than 5 or 6 items almost every day, will Allah Ta'ala will like it?

3. And if anybody wastes foods mostly due to cooking too much, that person will be sinful?

4. If a wife's husband always wants to eat more than 5 or more items, but she is busy with her kids and other household works, and her personal prayers, will she be sinful?

Earning money through deceiving people

Q: My husband works for a private company. They give fuel tanks for rent to foreigners. When the fuel in the foreigner's tanks gets dirty and it is of no use to them, the driver takes that fuel and sells it outside the bazaar. This driver is introduced to customers by my husband and my husband does a deal with him to split the profits. Is this money halal for us or not?