Heat oil in a large stockpot over medium heat. Add onion and cook until translucent, about 5 to 7 minutes. Stir in okra, tomatoes, and herbs and bring mixture to a simmer. Continue to cook for 15 minutes, stirring occasionally.Arrange fish on a plate and season with Doe’s. Transfer fish to pot, and continue to simmer until cooked through, about 10 minutes. Stir in sugar, vinegar, and hot sauce, and season with salt and pepper.Serve stew over cooked rice.