Conditions for the validity of Nikaah

Q: I want to ask a question and want fatwa. I am a psychiatric patient suffering from serious mental illness under treatment of a qualified doctor. The disease can be controlled but can't be finished. Also I had a blood disease thalesimia minor, which if my wife/partner also has (which is not tested yet), can cause to give birth to a baby with serious blood disease. I knew that before marriage and my physician told me that where you want to get married to take blood tests of the girl you want to get married to. We did not tell and hide where I was engaged my serious mental illness and blood disease which is minor. Now my wife and her family knows my mental disease because of my behaviour and medicines which I use not blood disease and she has give me a chance of few months to improve my self. If she see improvements she will decide to continue marriage with me or not. I am trying to improve my self. Is Nikaah Halaal and as we hid my mental and blood disease from my wife and her mother before marriage?

Q: Are the Jews and Christian of today still considered to be Ahle Kitaab. Especially the Christians, can one get married to them even though they do not accept Islam on the basis that they are Ahle Kitaab? 

Q: I married a sister about 18 months ago. She had a contract in which I signed that stated I cannot have another wife for five years. Due to unavoidable circumstances I married another wife. Is my first nikkah still valid?

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?