Amber...
I undrstud
..u lov ur mother and needs their blessings for ur life? isnt it?
first of all u take care of urslf.. its a hard situation u r going on... so never lose hope... n never let emotion take u in wrong path... remember ur mom loves u , she needs u... she is trying to protect u from any harm,...
so always first priority is MOM... am sure she will get convinced ...
in ths case...First: go see a doctor. take gud care of ur health
second: ask ur fianceto go meet ur mother and granny and whoever... he shud b determined enough to b success in his mission of conqueringur mom;s love...

Allah will bless u....