Changing one's name

Q:  I am 21 years old and currently going through a divorce. I also get ill quite a lot, usually migraines, bodyaches and fever. Someone suggested that I change my name. I want to clarify if this is the right thing to do.

Do illegitimate children inherit after their parents get married

Q: A Muslim lady got married to a non Muslim and had 3 children from him. If the marriage is not valid and the children are considered to be illegitimate and not inherit from their father even if later on he becomes a Muslim, are such children still considered to be illegitimate? Will they inherit equally with their brothers who were born after the fathers conversion?

Dream

Q: I saw in a dream that in the sky was written "laa illaaha illallahu mohammadur rasool Allah" and on the right side I saw Allah and on the left side Mohammad. The sky was very blue. What is the meaning of this? 

Women who were ungrateful to their husbands

Q: The hadith says the majority of people in hell are women who were ungrateful to their husband's. I'm divorced, I did everything for her, she cheated on me, stole from me, I always gave her dawwah but she ignored. I'm not saying I want her to be punished. I just want to be compensated in the next life. However does that hadith only mean a wife who continues to be married or both?

Borehole water mixed with the sewer line

Q: I have a small well in my home called borehole. Recently i've come to know that the water changed it's smell and this is due to maybe the outside line of guter/drain is mixing in the well water although the well is quite deep almost more than 40 feet. What would you advise as per the water? Has it become impure or can it be used for bath and other purposes?