Bismihi ta'ala
 

As jurists say, it is prohibited to buy or sell pig meat, but as for working in a place that serves pork, it is permissible. The problem would arise if you yourself were to prepare or serve the pork, in which case most jurists say it is of obligatory precaution to avoid. 

You would need to refer to you Marja' Taqleed for the specific fatwa on this issue.

And Allah knows best. 

Bismihi ta'ala

In brief, each School of Thought has its own collection of hadith books, and also its own methodology of categorising the grading of hadiths. This means which hadith is authentic, which is accepted, weak, fabricated, and so on.

It is for this reason that there is no specific book both Shi'ah and Sunni scholars would agree on. Yes, there are certain hadiths, in fact many of them, that both Schools would agree on. But not an individual book as a whole.

Bismihi ta'ala

Just because you might have some doubts, or even excessive doubts about certain things, it does not mean you have "OCD". We must remember that such problems must be diagnosed by a psychologist or a professional in that field. 

Scrupulosity starts off very innocently, due to one's concern about getting their religious acts right and valid. However, it turns in a very bad state that make one very miserable in the areas they suffer in.

Bismihi ta'ala 

Protection from Almighty God will always be with us, and we find the Almighty will always be there to give us the strength and will-power to overcome hardships and difficulties.

Your struggle is indeed a difficult struggle, and therefore with abusive relationships it is always important to try and realise that the cycle of abuse must stop. You need to gain confidence in yourself that you are able to continue living with honour and dignity, and you deserve better than to be treated in such a way.

Bismihi ta'ala

Although from a shar'i perspective this might not be obligatory, but one is asked it would be haram to lie and not tell the truth.

Also, ethically it is important for both sides to be transparent and clear about everything. Present everything to each other, and it is up to both sides to decide and agree, or disagree.

The problem with concealing such information is should it surface later on, it will become very difficult to contain and could lead to deep issues.

Wassalam