How much trouble am I in?

pull a cover and post a picture. After it has sat overnight take a clean container and pull the drain plug. Collect the first 1/2 a quart and put the drain plug back in. If there is significant coolant in the oil, a good portion of the sample will be coolant. Post a picture of the sample. If you decide to change the oil and run it. I would drain the coolant and replace with straight water. Water is slightly easier than coolant on bearings IIRC. Pictures help a bunch.