Many times stressful events like medical illnesses or family troubles can precipitate an episode of depression and anxiety. Fibromyalgia
also belongs to the same spectrum of diseases. I agree with your decision to see to a psychiatrist
as it is indeed difficult for others to understand what is going on. Medications of the SSRI and SNRI classes (escitalopram, sertraline
etc) will benefit depression, anxiety, PTSD as well as fibromyalgia. You can discuss this with your psychiatrist and choose the best one for you. However, till you get to see a psychiatrist, you can try to reduce your stress levels by doing meditation
or relaxation exercises like deep breathing or muscular relaxation. These will also control the anxiety symptoms.
Hope this helps you. Best wishes.