Factors that allow one to invalidate the fast

Q: I am a diabetic and insulin dependant. I am fasting and my sugar levels have dropped below 4. Is it permissible for me to break my fast or do I continue fasting? What is the punishment for breaking my fast?

Q:

1. If I fast and have a severe migraine with vomiting nausea dizziness, is the fast valid?
2. Too much coughing, fever and headache, low sugar, is it compulsory to fast?

Q: I am a lactating mother and feeding my child. My daughter is 1 year old. I heard that when mothers are feeding their children they are free from the Farz of roza (fast), is it true? If temporarily mothers are free then is there any Qaza of these rozas (fasts) after lactation or permanently lactating mothers are free?

Q: Can a pregnant and breast feeding mother break/miss the fast in Ramadhaan? Does she have to give fidya of the missed fast only or she has to keep the qadha later on? Is it ok if she gives fidya only? Can you please let me know the fidya for one fast.

Q: I would be grateful if Mufti Saheb could advise me on what is best course of action with regards to my situation as follows:

Ramadhan is just around the corner. I have a 9 month old baby who is breastfeeding and two other children. The fasting days, will be very long, as I live in the UK. What should I do in this situation?

1. Should I carry on breastfeeding while I observe the fasts?
2. Or should I wean my baby off so then I may be able to fast bearing in mind that she's hardly one year old in age?
3. Or do I continue breastfeeding but do not observe fast and make up the fasting days immediately after Ramadhan?
4. Or should I teach her to drink from the bottle, drinking my milk, and observe the fasts?

Please advise accordingly.  Also, I am a Shafi'ee.

Q: I have a three month old baby who I am breastfeeding. The month of Ramadaan is approaching and I want to know whether I should fast. I am not sure whether I will be able to manage keeping the fasts. 

Q: Today a woman has the option of feeding her infant with milk-based formula. Keeping that in mind, is she still allowed to miss her fasts if she breastfeeds her child and is weakened because of it?

Q: I have an ulcer and what happens is that if I do not eat than I get sever pains which is really bad times. The doctor advised me to eat quite often and not let my tummy go empty. I find it hard to disobey the command of Allah Ta'ala and I love fasting so much! Can I just carry on fasting?

Q: A person while fasting in the month of Ramadhaan had fallen ill. The doctor advised him to break his fast. Is he sinful for doing so and will both qadha and kaffarah be waajib or only qadha?