Holding one's mother's head and taking a qasam

Q: I did a job in Saudi Arabia. On my vacation my mom came to know that I am connected with a girl (na mahram) with love. My mother told me to put your hands on my head and take a "qasam" that you will not talk to your lover in future and you will forget her. I did as she said with intention that I will follow her qasam. But I came to know that this type of qasam is haraam in Islam, so what is the worth of that "qasam". Could I break that? or my mom has to take beg for forgives from Allah because my mother never mentioned the name of Allah in her qasam? Please answer me soon as possible.

Accepting Islam and concealing it from one's family

Q: I converted to Islam. However, I have kept it from my family knowing that they will not accept my newfound religion and because of all the negativity about Islam in the news. Chinese people, including my family, are very close minded about preserving their culture and religion. But It's taken a really huge toll on me mentally. I'm not too fond of hiding my "new self" from my family and I think it really strains my relationship with them. I always have to lock my door when I pray and I always have to sneak out with the hijab or put it on when I get outside, which is a very difficult task and I think them not knowing somewhat hinders my full potential as a Muslim. For example during Ramadan, my mom would reprimand me for not eating and make me eat and etc. What should I do? Should come clean knowing that they will disown me or should I continue to keep it to myself?

Breaking off a haraam relationship

Q: I have one problem and I need to know that what should I do. I am 28 years old and married 6 years ago but 3 years back I met a guy on chat. We became close friends, we even started loving each other but many times I feel that I am doing wrong. I am cheating my husband. I decided to break relation with that guy but don't know, I feel like I hurt that guy as he was in love. Now without letting him know any reason, I am not in contact with this guy because I don't want to do any sinful deed anymore. I want to know that did I do the right thing? But one feeling is still in my mind that maybe I hurt that guy and maybe he will not forgive me. Please guide me what should I do?

Tahajjud Salaah

Q: Allah Ta'ala affords and blesses me with Tahajjud. Some times a few minutes before Fajr, I am sometimes so rushed to perform this ibaadah that I tend to forget the proper way, mindset and recommended acts whilst performing this Salaah. Please give me advice on what my connection, mindset should be like at this mubarak time.