Oprah Sued -- I'll Fix Oprah's Wagon ... She Stole 'Fix My Life'!!!

Oprah Winfrey ripped off the hit series "Iyanla: Fix My Life" ... according to a woman who's had beef with mighty O for years. Otisa C. Strickland claims in a new lawsuit ... 'Fix My Life' -- which appears on OWN -- is a carbon copy of a show she…