You obviously need to consult a lawyer.
That said, the validity of the pre-nup MAY depend on where the marriage took place. If it took place in the DR, then it needed to be in Spanish (and possibly needed to be drafted by a Dominican lawyer). If it took place in Canada English may be okay.
How long have you been married? If the marriage took place in Canada and you've been married for a very short time, you might be able to claim fraud.
Once again, you need to consult a lawyer. If you need a Dominican lawyer I would use the moderator of this forum, Fabio Guzman.