Since it was running and driveable before turning on the feedback, I would guess that the wideband was overfueled for long enough before turning it on that it ruined it.
I would suggest turning off the correction, clearing the learn table, cleaning the plugs, get it running as well as you can manually with the bad sensor, then install a new sensor. Ignore(and let the ecu ignore) the bad o2 sensor and tune it by ear as you have done for years. You'll then be in the ball park for the fresh sensor.