Hajj & Umrah

Q: I live in Saudi Arabia. I performed Umrah one week ago, when it comes to do qasr or halq, I got pain in on the side of my foot. I reached quickly  at the barber shop, they were closing shop due to prayer. I insisted but they refused to cut, they instead cut some hair from the upper side and another person with me also done it. After Prayer I wanted to cut my hair further, but due to much pain in the foot I could not go there. Then some one told me it is necessary to cut quarter  of the head but I could not do it, now  i'm back at home, and was thinking about it, either that qasr is enough for me or not, so my question is was this act enough to become halaal or not? If not, what do I have to do right now?

Q: My parents, myself and my 2 kids son 9 and daughter 10 were supposed to go for umrah. I have had many developments after booking. My dad is in hospital due to a weak heart condition. And I was given talaaq. Can I still go for umrah with my son as my mahram?

Q: What should a woman do when her wudhu breaks while doing tawaaf in the time of hajj where it is very difficult for her to go and renew the wudhu?

Q: Is applying ointment for pain or other cause also prohibited after one had entered ihram, because normally all ointment has a scent whereas all scented things are prohibited in the state of ihram?

Q: Can a woman perform Hajj if she does not find any mahram?

Q: A female scholar in Masjid Nabwi told my wife that it is permissible to cover the face while doing Umrah and that there is no proof for covering the face while doing umrah. She followed her instruction and did umrah while her face was covered with niqaab. Was the female scholar correct? Does my wife have to pay any type of compensation?

Q: I would like to know if going for umra is a Fard or Waajib?

Q:

1. I'm travelling for umra with my family in a few days. I have 4 children's, they are 11 (daughter) 9, 7 & 4 (sons) years of age. Will they have to wear ihram and does the rules of ihram/umra apply to them equally?
2. My late father made a vow to take my youngest brother and perform umra with him. I'm planning to fulfil this vow. The only thing is my younger brother is disabled (Down syndrome). Does he have to wear ihram and does the  rules of umra apply to him?
3. Which is more rewarding to perform nafal umra or nafal tawaf?
4. If I perform a nafal tawaf/umra does it have to be for only one person or can I perform 1 nafal tawaf/umra for more then 1 person?

Q: What are some of the main and specific reasons as to why a man can perform Hajj by himself and a woman requires a mahram? I understand one of the reasons being the physical intensity of performing hajj but won't one be able to use the excuse of going with a group of women?