I have looked at FQ which is phobic specific and doesn’t seem to cover panic disorder, GAD-7 which seems ok but was designed for generalized anxiety disorder, and BAI is expensive.
Have you considered the following: Depression Anxiety and Stress Scales (DASS), Spielberger State-Trait Anxiety Inventory (STAI), Hospital Anxiety and Depression Scale-Anxiety (HADS-A), the anxiety-related scales of the Symptom Checklist-90-Revised (SCL-90-R). Read their descriptions and items and choose which scale suits you best (if not sure, trim down to 2 instruments and try to use both).