My employer shared my medical information?

So, I had an accident at work today. I was sent to be seen by an Immediate Care Clinic and following my appointment, I sent the information to my boss to inform him of the extent of my injuries and to ask where to get my prescriptions filled at ( in case the worker's comp said it had to be a specific place). So after a while I got a response. He sent the picture of my Work Status notice will all my information and everything from the exam to the owner ( which is to be expected ). But then the owner's wife (who is a doctor) said that I needed to get the generic for the prescription, and told me the specific drug to tell the pharmacist to give me. I have no issue with getting the generic, but I do not like him having shared my medical information with his wife who is not the registered owner and is not at all part of the company. Do I have any stance to complain to him about it? I don't know why it bothers me so much, but it does really bother me. I question who else he has or will share my personal information with.