Differential diagnosis of anxiety

​Differential diagnosis of anxiety are : 
-pheochromocytoma 
-hyperthyroidism 
-generalized anxiety disorder
-caffeine 
-nicotine
-amphetamine 
-cocaine 
-psudoephedrine 
-alcohol withdrawal 
-benzodiazepine withdrawal 
-adjustment disorder
-major depressive disorder
-obsessive compulsive disorder
-panic disorder 
-somatoform disorder