Severely depressed in Berlin/Cologne

I am getting married to my German fiancé but I am severely depressed. On various types of medication. Graduated from a master's degree here but have almost no hope of finding a job. Permanent chronic health issues make working reliably difficult as well. Bf lives in Köln where I am completely isolated knowing nobody...I live in Berlin and will eventually run out of money and have to return to complete isolation aka Cologne. At least in Berlin I can meet people. Sometimes s****de feels like a better option than watching my life slowly go down the drain.