Getting a work permit would not be that easy. For a start, unless you have a degree or three years relevant work experience, you wouldn't qualify anyway. Secondly, your fiance's mum would need to advertise in an EEA wide circulation paper to try to recruit, and would have to show why each applicant was not suitable, but you were. Thirdly, she would have to pay you a comparative graduate salary; this would have to be at least £20k in my experience, depending on where she lives. From the sounds of it, none of this would be possible.
I know it is difficult, but plenty of people have to put up with long distance relationships and, though ti is difficult, they last the distance. Lots of people on this site have done it, my brother did it for seven years with the Canadian girl who is now his wife....I think that you have little choice.
Victoria