My Son, Age 28,is Being Treated For Anxiety. He Has

my son, age 28,is being treated for anxiety. He has been taking Zanax but the insomia has come back, and he also has no appetite. His dr. today changed med to trazodone, first pill he threw up in 2 minutes. he has not been eating anything, milk is all he can keep down. i'm worried that something else besides anxiety is going on. He does work a fairly stressful job, 12 hr rotating shifts for 3-4 days at a time, off for 3-4 days. He's done this for 2 1/2 years and loves his work. He's seeing an MD and also going to a psychologist (2 visits) I think that maybe he needs to get another dr. Thank you.