Oaths & Vows

Q: Please tell me what is the kaffarah if some one failed to fullfil his mannat? 

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?

Q: If I have previously in the last 5 years said (by allah) and was lying then will kaffarah be wajib? I just learned about kaffarah recently so should I repent and abstain from swearing by allah on a lie or do I have to pay the kaffarahs of the past few years which I'm not aware of how many times ocured?

Q: Courts in my country require people to take oaths of the quran before saying anything. Is that ok?

Q: While I was suffering from a bad condition, I started seeking forgiveness (saying استغفرالله) and I asked Allah to remove the bad condtion of mine, and in my heart I promised Allah to do specific religous deeds when the bad condition is removed (as I thought the bad condition is fom my bad deeds). Is this promise regarded as an عهد or نذر? Can I pay kaffarah and abondon doing according to my promise, as it is very difficult for me to do what I promised? If I neglect my promise, would it be like this aayat: 

وَمِنْهُم مَّنْ عَاهَدَ اللّهَ لَئِنْ آتَانَا مِن فَضْلِهِ لَنَصَّدَّقَنَّ وَلَنَكُونَنَّ مِنَ الصَّالِحِينَ فَلَمَّا آتَاهُم مِّن فَضْلِهِ بَخِلُواْ بِهِ وَتَوَلَّواْ وَّهُم مُّعْرِضُونَ فَأَعْقَبَهُمْ نِفَاقًا فِی قُلُوبِهِمْ إِلَی یَوْمِ یَلْقَوْنَهُ بِمَا أَخْلَفُواْ اللّهَ مَا وَعَدُوهُ وَبِمَا کَانُواْ یَکْذِبُونَ

Q: Are all promises to Allah considered as Ahd عهد in fiqh or should we say the word "Ahd عهد" if we want to establish an "ahd" with Allah?

Q: If a person thinks to himeself that "I promise Allah Ta'ala that I will not do a certain thing, or I will do a certain thing" and then he is too weak willed to carry out that oath, do they have to give kaffara? And if that happened more then once, do they have to give kaffara for each broken oath or will just one kaffara be enough? {lease bear in mind that the person was not telling anyone else, but just thinking aloud to themselves.

Q:

1. My question is that if a person makes a promise to Allah that every time he commits a certain sin he will give 'x' amount of money to charity and then commits that sin, does he have to give that money as well as kaffarah, or is that money classed as kaffarah?
2. Secondly, is their a way to end such a promise as even though that person is trying to eradicate that sin, occasionally there are relapses, and therefore to prevent committing two sins i.e the sin itself and the breaking of the promise, could that person end this promise?

Q: What is kuffarah for an unfulfilled Qur'an oath? I took an oath of not missing salaah with a sheikh online who gave me zikr for weak memory and doing good in medical school. I did the zikr for a while and then stopped it. I totally forgot about the oath. I do pray but not regularly? So now I am in last year of my medical school. I have a lot of prayers to make up. Can you please guide me about the kuffarah? Do I have to make up all the prayers and is there a kuffarrah along with it?