Anxiety Support Group
Anxiety is a physical condition marked by intense and persistent feelings of distress, fear, angst or dread. General anxiety caused by routine day-to-day stresses usually passes quickly and is experienced by almost everyone at one time or another. However, such feelings that linger over time and are very difficult to cope with, and which lack a clear cause, may indicate...

Brain chemistry. Natural chemicals in your body may play a role in social anxiety disorder. For instance, an imbalance in the brain chemical serotonin (ser-oh-TOE-nin) may be a factor. Serotonin is a neurotransmitter that helps regulate mood and emotions, among other things. People with social anxiety disorder may be extra-sensitive to the effects of serotonin.
Brain structure. A structure in the brain called the amygdala (uh-MIG-duh-luh) may play a role in controlling the fear response. People who have an overactive amygdala may have a heightened fear response, causing increased anxiety in social situations.
I hope you and your therapist are working towards finding the cause of why you become so anxious when a new male enters your social group because, based on my experience, once you find the cause you can heal it and the anxiety will go away.
I do hope your Dr. gets back to you today and is able to calm your anxiety about whether or not it's a chemical imbalance. Anything that brings you peace of mind is a welcome addition to your day.
Take care