I painted a room with what I believe now was spoiled paint. It's been 2 months and I can't get rid of the smell. A cross between sour milk and mold.
Will the smell go away or do I need to do something? Will it make me sick?

Removal may not be possible so try covering it with KILZ. Masterchem Industries, Inc. (http://www.kilz.com/) If the smell is gone after KILZ then get a fresh topcoat of new paint.