Conditions for the validity of Nikaah

Q: I am a sunni girl Alhamdulillah. Fortunately or unfortunately I like a shiaa boy. For a long time I was unaware about the major differences between shiaa sunni. Now when I have come to know I am confused ....very confused. We both have already committed to each other about getting married. Now Sir ... I want your help. Can you please tell me is it not halal for a sunni to marry a shiaa? And what is the reason if it is haraam? After all Shiaa's do also believe in Allah and read the same kalima. Awaiting your answer.

Q: Can a woman's nikaah be performed during her menses?

Q: My question is I recently had my ketb ktab my families and my wifes family were present. It was recorded and placed on Facebook for all to know.  Does this count as a valid announcement? We are still planning on having a wedding celebration in a few months. But I am told I can't sleep with my wife unless I have a proper public announcement. Please clarify or confirm that the facebook announcment and my families and my wife and I telling others about our marriage is valid enough? 

Q: A couple engaged in a mut'a marriage. They realized after some time that mut'a is not allowed. Is their nikaah valid or should they perform another nikaah?

Q: Is the nikaah valid if the man used someone else's identity. Name, surname date of birth all belonging to someone else. After he left his wife it was discovered that he is not the person he pretended to be?

Q: If the person performing nikaah becomes 1 witness and 1 other male person. Is nikkah valid or does it have to be 2 different people. Not the person performing nikaah?

Q: When someone does nikaah at home. What is the procedure with witnesses? How many does the male need and how many the female? I have heard even without witnesses it is counted and it is only sunnat to have witnesses and to do khutbah. If someone has done nikkah without witnesses and khutbah is it counted?

Q: If a woman has received her 1st talaq, she lives separately from her husband and her idda is over after three mestruations and there is no reconciliation from any party. Does that mean she is free? or the husband has to give her a 2nd and again a 3rd talaaq?

Q: I am so worried after reading that a marriage without a guardian is not right. I am hanafi and always thought that it was fine for me because I was married before already and have kids. I married without telling my parents because they never would allow me to be a second wife. Someone else acted as my guardian at the nikaah. All I want to know now is am  I living in haraam? 

Q: Would the nikah of an intoxicated person who was not in his senses be valid?