Ramadhaan & Fasting

Q: My age is 45 now. I became baaligh at the age of thirteen. Without any reason I was not fasting in Ramadhaan, until my age of 22. But after that my life changed and I began to lead a pious life. As I'm a lady I miss rozas due to periods every ramadhan. Also I left full rozas in 2 Ramadhans due to pregnancy. I'm doing qaza of my rozas since the age of 22. But it has become a huge burden upon me as I have to make qaza of hundreds of rozas and also with the mudd that should be given to poor on each roza. Mudd also doubles each year as I could not make qaza of these hundreds of rozas in one year. I am a follower of the shafiee madhhab so I request pious solution for this big problem.

Q: I have few farz rozas due to keep from last ramazan because of monthly period and one of them I left because of severe migraine headache.
Most of the time when I fast I have severe migraine headache with nausea which is quite severe. My question is can I give fitr for the above rozas or do I need to keep it despite the headache.

Q: I know that inhaling steam or smoke while fasting causes the fast to break. My question is that when cooking food while fasting, there is a great risk that steam will be inhaled. Will it be necessary to take precautions to avoid the steam by keeping a distance from the cooking food as much as possible? In the case where one inhales steam unintentionally, will one's fast break?

Q: What's the ruling on missing days in Ramadaan due to sickness? Or any reason? Some one was telling me you just have to make it up? Others say you could only make it. You can not feed poor people?

Q: I had a question about fasting for my mother. She is sick and on mediation? She can't fast do to sickness? Is she required to feed poor person or what she has to do?

Q: Can we fast any day or there are any restriction that we can't do qaza on Friday or Saturday?

Q: If a person broke fasts at least once over several Ramdhaans during their youth, do they have to give kaffara just once for all the Ramdhaans or do they have to give kaffara seperatly for each year?

Q: Can we keep nafl roza on the 11,12, and 13 Zil Hijjah?

Q: My question is that can my mother complete the fardh namazes,fasts etc of her mother who had passed away (dead) so that she will be safe on the judgment day? Or there is some other way in Islam by which we can fulfil the remaining fardh ibaadaat of relatives who are no more alive?

Q: I want to know that 5 years ago I was pregnant for my daughter in the month of Ramadaan, so after she was born I wanted to pay in the missed fasts as I have done for my eldest, but a moulana told me it wasn't neccessary I just have to pay fidya. Now people are telling me that I have to pay in the missed fasts. What am I suppose to do now?