Ramadhaan & Fasting

Q: Is it true that one cannot fast on 11th, 12th and 13th Zul Hijjah? 

Q: What is the ruling for a fasting woman who inserts portion of the tissue into the private part for istinjaa? Will her fast break through this?

Q: If I have not kept many fasts without any valid reason in my childhood, when I became baligh how do I fulfill it? Do I have to make kaffara? What is the kaffara and what if the amount of fasts is so many and I don't remember? 

Q: Is there any punishment for a person who deliberately misses fasts continuously without any reason and has it in mind to make up for those days after Ramadhaan?

Q: I am able to fast though I am not in good health. Lately I am suffering from bouts of fever for no apparent reason. I know that fever means that I have to break my fast. If I develop fear say an hour before Ifthaar, how long can I postpone Ifthaar and how close to Ifthaar can I break my fast so that my fast would still be valid for the day?

Q: If I keep my qaza fasts and nafl fasts without eating sehri, will the reward be less?

Q: While fasting, haidh began early in the morning, a few hours after fajr.

1. Is there qadha for this fast?

2. Is the ruling different for fardh fast and nafl fast?

Q: How we can decide when it's the right time to stop sehri?

Q: A friend of mine bagan keeping a Shawwal fast. About 10:00 she decided to break her fast although she did not have a valid reason to. Is this permissible? Or does one have to have a valid reason to break a Shawwal fast?

Q: If I intend to make itikaf for last 3 days of Ramadan but before sitting for it I get my period do I have to make qaza?