So sorry to hear of what is currently troubling you. The break up would have had a significant impact on you emotionally, and understandably so. Is there any chance of a reconciliation with your fiancé or is it completely over? Have you heard from this person at all since? Or have your tried to contact them?
Are there any new jobs in your field that you could apply for? Perhaps seek the advice of an employment agency who can link you into new opportunities :) All you will need to do is book in a time, bring along an updated resume/CV and they'll do the research for you - especially if you're feeling mentally exhausted. Depression can do that.
Some practical tips. Please keep me updated if you wish, I'd love to help you along. x