You may not like what I have to say, but colds are treatable in a week. Severe asthma is treatable in a week. Bipolar disorder, on the other hand, .... um no.

Someone who says that you have "one week to get better, or else ..." does not seem to understand the magnitude of your troubles. Or, were you exaggerating ? Did she say you have to start treatment within a week ?

Also, since I don't know your story, if I may ask (you don't have to answer) ... why did she wait till this point (your engagement) to give you this ultimatum ? Is this not something you guys discussed along the way ?

Sorry if I've come across as rude or insensitive here. I'm playing the neutral objective observer, and I would like to know more, so I can offer you advice, instead of making assumptions and BSing you.