Transmission

Car has had a transmission flush and added fluid and also ignition coil was bad was making a whining noise about a week ago now its making whining noise again started at like 30-45 miles a hours after about 2.000rpms and drove it a few days and now it can't even go short distances without the noise and seems like it's stalling it accelerates poorly and acts like it doesn't want to move my mechanic thinks it's the torque converter. I'm not sure please some advice