Fulfilling the promises one made to Allah Ta'ala

Q: If a person makes a general promise to Allah like for example Allah I promise that I will pray all 99 names every night. Or I promise to read certain amount of durood every night. Or I promise to study this amount, He says these outloud. Is he sinful for not doing these. Are they permanent or can a person speak to Allah in his duaa and take it back? And what if he forgot a certain promise he might have made, will he be accountable for that?

Facing the wrong direction and Performing Salaah

Q: About 2 months ago when I prayed Dhuhr in school, one girl changed the direction of the prayer and I prayed with her even though iI had severe doubts about if it was the right direction. I then found out that it wasn't the right direction but I didn't repeat the prayer. Should I redo the prayer? And is it as if I didn't pray? I had forgotten about this incident, it recently came to my mind, what should I do?

Forced mahr

Q: My question is about Mahar. Please tell me about the forced Mahar. I heard in an Islamic channel about forced mahar a caller call mufti and he said that he did a nikah but in nikah his in-laws and girl's uncle forced him and his family to write 200,000 Pakistan Rupees in Mahar but the boy did not agree to accept that huge mahar amount from his heart. Due to some family reason's he accepted. So he Asked Mufti that now who will pay the Mahar since I am not able to pay it. The mufti replied in this scenario you were willing to marry that girl but you don't agree with Mahar from your heart and the In-law's or any person forced you to accept it and due to family reason's you accepted that Mahar, so now you are not responsible to pay the Mahar nor your family. Now the person or person's who forced you to accept that mahar will pay your Mahar to your wife. Please tell me, is that Mufti's opinion right or wrong and please also provide me a hadith as a reference with Translation in Urdu or English. 

Wazifa for financial problems

Q: I am in problems nowadays. My brother's wedding is fixed in march but I can't go to Pakistan because we are in debut which can't be paid even in two or three year. I want you to give me a waizfa so I can go to Pakistan. Please help. I am very much disturbed and weep all the time. Please help.