Suffering from OCD (mental health condition)

Q: I have been diagnosed  with OCD - a mental health condition and I have had it for around 2 years. I have been a mental health patient in the UK for a long time as well and I am also on anti depression medication. At one point in the past, it took me around 60 mins to read a four unit fard
zuhr prayer consisting of surah fatihah and surah Ikhlas. I have also had severe problems with wudu and ghusl. Because my prayers are too long, I have not been able to get a job, or go to University. I don't know if my illness will ever leave me and it has been destroying my chances of earning a halal income-which is wajib upon me. Is it permissible for me with my illness at the time of need so that I can earn a halal income/ study/train to order to earn a halal income to miss: 

the sunnah aspects of the prayer
sunnah prayers
sunnahs of wudu
sunnahs of ghusl

Otherwise I fear it with my health problem, life would be very difficult for me in the future.

Meeting up with a boy on facebook

Q: I have met this guy on facebook. At first we use to chat and just be friends and then one day my parents found out and I stopped talking to  him. After a while I got in contact with him again. I really missed him and realised I was in love with him. Now that I speak to him, he knows I love him and he has asked me to marry him and would I talk to my parents? I don't want to do anything haraam. I have tried to forget him and I couldn't. Is there anyway, advice or duas that I could pray to help me with this. I rally want to marry him and have a halaal relationship.

Substituting the Sunnah Muakkadah with Qadhaa Salaah

Q: A person has excessive (many years) of Qadhaa Salaah. Due to weakness, would it be correct for a person to substitute the Sunnah Muakkadah
before/after each Salaah with Qadhaa Salaah? For example, at the time of Fajr, instead of performing two Rak'aats of Sunnah Muakkadah, a person makes intention and performs two Rak'aat of Fajr Qadhaa. Or at the time of Zuhr, instead of performing four Rak'aat of Sunnah Muakkadah, a person performs four Rak'aat of Zuhr Qadhaa. Would this be correct?

Difficulties living with one's parents

Q: I am currently living with my parents and I have endured many difficulties during the past nineteen years of my life. My father is extremely verbally abusive to us I.e my mother and siblings and dawns all his anger on me. I try my best to be obedient to him and I can't recall when last I haven't obeyed his commands but he persists in lashing out on me and forcing me to do that which is haraam, he also never spends on us and we are often left  stranded and miserable. Can you please give me a method in which I may quell his anger or make him realise his actions unto us are wrong?