This is so difficult. I think nobody is really qualified to advise another person what to do, except if you feel that his behavior rises to the level of abuse (either physical or psychological), in which case I would say run for your life because it gets harder to break away as the abuse progresses. What concerns me is that it sounds like he, and possibly his family, is blaming you for his suicide attempt. This may sound harsh, but it was his decision to attempt suicide, and he is the one who has the ultimate responsibility for his well-being and mental health, and it is grossly unfair and a red flag that anyone tries to manipulate you into thinking otherwise. Please do not go on with the relationship because you feel guilty or afraid of what he might do to himself if you leave him-- nothing good will come of it.
If he really is bipolar and you decide to continue the relationship, you sign up for having a patient as well as a husband. This said, some people get it under control with medication and by being very disciplined in avoiding situations that might trigger a strong response. I know a few people with similar serious mental illnesses (not sure whether they are bipolar) who are in successful long-term relationships but it is very hard on the other person. Also, none of them deals with the additional strains of leaving their country and family behind. In fact one man I know who suffered from severe bouts of depression declined an invitation to study at a very prestigious university abroad (he's brilliant) because he was afraid he would not be able to handle being away from family, friends and a familiar environment.
I can only say look into your heart and be very honest with yourself about whether you really love this person more than anyone in the world and whether you have the strength to deal with all the problems you already know you will get into. No matter what you decide, make sure you don't turn into a slave of his illness. Until proven otherwise, I believe that each of us has only one life and you deserve to make the best out of yours. You have to make it clear that his illness does not make it acceptable for him to treat you badly and that he is still accountable for his behavior.
As for whether you should go over there-- again, be very honest with yourself. I would first try to decide what to do and then figure out what would be best for him. If you decide not to continue the relationship, it may make things worse if you visit him. You may also want to discuss this with his family if you feel comfortable with them and trust their judgment, or perhaps with a psychiatrist who knows more about this illness.
Take good care.